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#1 Re: Meta New Mars » Calliban Postings including links to notable contributions » Today 13:35:59

For Calliban .... to my surprise, Gemini invited you to assist if you might have time...

I reported the results of the test run, and your observations... I think Gemini is struggling with this problem.  I know I would be.

Hello Again! Our mechanical engineer took an interest in the data generated by our little study program, which I will upload in a moment. He asked about the plasma state of the gas, which he said seems likely at the temperatures the Python program is calculating. He also added notes about the kinetic energy imparted to the gas and computed a figure that he thought might be in play. I believe your program is already attempting to calculate the energy flows. I don't see having the gas in a plasma state is being advantageous. Here is a quote. I appended a Google lookup for alloy vs temperature ...

python3 20250828ThermodynamicsStudyV01.py

--- Thermal Model Test ---

Number of Pipes: 66

Total Cooling Surface Area: 1500.00 m^2

Initial Pipe Temp: 100.00 K

Initial Gas Temp: 288.00 K

--------------------------

Time: 0.00s | Gas Temp: 59775.22 K | Pipe Temp: 200.17 K | Mass: 105.83 kg

Time: 0.01s | Gas Temp: 59776.32 K | Pipe Temp: 299.81 K | Mass: 211.66 kg

Time: 0.02s | Gas Temp: 59777.09 K | Pipe Temp: 399.17 K | Mass: 317.50 kg

Time: 0.03s | Gas Temp: 59777.71 K | Pipe Temp: 498.31 K | Mass: 423.33 kg

Time: 0.04s | Gas Temp: 59778.25 K | Pipe Temp: 597.25 K | Mass: 529.16 kg

Time: 0.05s | Gas Temp: 59778.74 K | Pipe Temp: 696.00 K | Mass: 634.99 kg

Time: 0.06s | Gas Temp: 59779.20 K | Pipe Temp: 794.57 K | Mass: 740.83 kg

Time: 0.07s | Gas Temp: 59779.64 K | Pipe Temp: 892.97 K | Mass: 846.66 kg

Time: 0.08s | Gas Temp: 59780.06 K | Pipe Temp: 991.19 K | Mass: 952.49 kg

Time: 0.09s | Gas Temp: 59780.47 K | Pipe Temp: 1089.24 K | Mass: 1058.32 kg

Time: 0.10s | Gas Temp: 59780.87 K | Pipe Temp: 1187.12 K | Mass: 1164.16 kg

Time: 0.11s | Gas Temp: 59781.27 K | Pipe Temp: 1284.84 K | Mass: 1269.99 kg

Time: 0.12s | Gas Temp: 59781.65 K | Pipe Temp: 1382.39 K | Mass: 1375.82 kg

Time: 0.13s | Gas Temp: 59782.03 K | Pipe Temp: 1479.77 K | Mass: 1481.65 kg

Time: 0.14s | Gas Temp: 59782.41 K | Pipe Temp: 1576.99 K | Mass: 1587.49 kg

Time: 0.15s | Gas Temp: 59782.79 K | Pipe Temp: 1674.04 K | Mass: 1693.32 kg  << 1643 Kelvin steel alloy melting point see Google below

Time: 0.16s | Gas Temp: 59783.16 K | Pipe Temp: 1770.93 K | Mass: 1799.15 kg

Time: 0.17s | Gas Temp: 59783.52 K | Pipe Temp: 1867.65 K | Mass: 1904.98 kg

Time: 0.18s | Gas Temp: 59783.89 K | Pipe Temp: 1964.21 K | Mass: 2010.82 kg

Time: 0.19s | Gas Temp: 59784.25 K | Pipe Temp: 2060.62 K | Mass: 2116.65 kg

Time: 0.20s | Gas Temp: 59784.61 K | Pipe Temp: 2156.85 K | Mass: 2222.48 kg

Time: 0.21s | Gas Temp: 59784.97 K | Pipe Temp: 2252.93 K | Mass: 2328.31 kg

Time: 0.22s | Gas Temp: 59785.33 K | Pipe Temp: 2348.85 K | Mass: 2434.15 kg

Time: 0.23s | Gas Temp: 59785.69 K | Pipe Temp: 2444.60 K | Mass: 2539.98 kg

Time: 0.24s | Gas Temp: 59786.04 K | Pipe Temp: 2540.20 K | Mass: 2645.81 kg

Time: 0.25s | Gas Temp: 59786.39 K | Pipe Temp: 2635.64 K | Mass: 2751.64 kg

Time: 0.26s | Gas Temp: 59786.75 K | Pipe Temp: 2730.91 K | Mass: 2857.47 kg

Time: 0.27s | Gas Temp: 59787.10 K | Pipe Temp: 2826.03 K | Mass: 2963.31 kg

Time: 0.28s | Gas Temp: 59787.45 K | Pipe Temp: 2920.99 K | Mass: 3069.14 kg

Time: 0.29s | Gas Temp: 59787.80 K | Pipe Temp: 3015.79 K | Mass: 3174.97 kg

Time: 0.30s | Gas Temp: 59788.14 K | Pipe Temp: 3110.43 K | Mass: 3280.80 kg

Time: 0.31s | Gas Temp: 59788.49 K | Pipe Temp: 3204.92 K | Mass: 3386.64 kg

Time: 0.32s | Gas Temp: 59788.84 K | Pipe Temp: 3299.24 K | Mass: 3492.47 kg

Time: 0.33s | Gas Temp: 59789.18 K | Pipe Temp: 3393.41 K | Mass: 3598.30 kg

Time: 0.34s | Gas Temp: 59789.53 K | Pipe Temp: 3487.43 K | Mass: 3704.13 kg

Time: 0.35s | Gas Temp: 59789.87 K | Pipe Temp: 3581.28 K | Mass: 3809.97 kg

Time: 0.36s | Gas Temp: 59790.22 K | Pipe Temp: 3674.98 K | Mass: 3915.80 kg

Time: 0.37s | Gas Temp: 59790.56 K | Pipe Temp: 3768.52 K | Mass: 4021.63 kg

Time: 0.38s | Gas Temp: 59790.90 K | Pipe Temp: 3861.91 K | Mass: 4127.46 kg

Time: 0.39s | Gas Temp: 59791.24 K | Pipe Temp: 3955.14 K | Mass: 4233.30 kg

Time: 0.40s | Gas Temp: 59791.58 K | Pipe Temp: 4048.22 K | Mass: 4339.13 kg

Time: 0.41s | Gas Temp: 59791.92 K | Pipe Temp: 4141.14 K | Mass: 4444.96 kg

Time: 0.42s | Gas Temp: 59792.26 K | Pipe Temp: 4233.91 K | Mass: 4550.79 kg

Time: 0.43s | Gas Temp: 59792.60 K | Pipe Temp: 4326.52 K | Mass: 4656.63 kg

Time: 0.44s | Gas Temp: 59792.94 K | Pipe Temp: 4418.98 K | Mass: 4762.46 kg

Time: 0.45s | Gas Temp: 59793.28 K | Pipe Temp: 4511.28 K | Mass: 4868.29 kg

Time: 0.46s | Gas Temp: 59793.61 K | Pipe Temp: 4603.44 K | Mass: 4974.12 kg

Time: 0.47s | Gas Temp: 59793.95 K | Pipe Temp: 4695.43 K | Mass: 5079.96 kg

Time: 0.48s | Gas Temp: 59794.29 K | Pipe Temp: 4787.28 K | Mass: 5185.79 kg

Time: 0.49s | Gas Temp: 59794.62 K | Pipe Temp: 4878.97 K | Mass: 5291.62 kg

Time: 0.50s | Gas Temp: 59794.96 K | Pipe Temp: 4970.51 K | Mass: 5397.45 kg

Time: 0.51s | Gas Temp: 59795.29 K | Pipe Temp: 5061.90 K | Mass: 5503.28 kg

Time: 0.52s | Gas Temp: 59795.63 K | Pipe Temp: 5153.13 K | Mass: 5609.12 kg

Time: 0.53s | Gas Temp: 59795.96 K | Pipe Temp: 5244.21 K | Mass: 5714.95 kg

Time: 0.54s | Gas Temp: 59796.29 K | Pipe Temp: 5335.15 K | Mass: 5820.78 kg

Time: 0.55s | Gas Temp: 59796.63 K | Pipe Temp: 5425.93 K | Mass: 5926.61 kg

Time: 0.56s | Gas Temp: 59796.96 K | Pipe Temp: 5516.56 K | Mass: 6032.45 kg

Time: 0.57s | Gas Temp: 59797.29 K | Pipe Temp: 5607.04 K | Mass: 6138.28 kg

Time: 0.58s | Gas Temp: 59797.62 K | Pipe Temp: 5697.36 K | Mass: 6244.11 kg

Time: 0.59s | Gas Temp: 59797.95 K | Pipe Temp: 5787.54 K | Mass: 6349.94 kg

Time: 0.60s | Gas Temp: 59798.28 K | Pipe Temp: 5877.57 K | Mass: 6455.78 kg

Time: 0.61s | Gas Temp: 59798.61 K | Pipe Temp: 5967.45 K | Mass: 6561.61 kg

Time: 0.62s | Gas Temp: 59798.94 K | Pipe Temp: 6057.18 K | Mass: 6667.44 kg

Time: 0.63s | Gas Temp: 59799.27 K | Pipe Temp: 6146.76 K | Mass: 6773.27 kg

Time: 0.64s | Gas Temp: 59799.60 K | Pipe Temp: 6236.19 K | Mass: 6879.11 kg

Time: 0.65s | Gas Temp: 59799.93 K | Pipe Temp: 6325.47 K | Mass: 6984.94 kg

Time: 0.66s | Gas Temp: 59800.26 K | Pipe Temp: 6414.61 K | Mass: 7090.77 kg

Time: 0.67s | Gas Temp: 59800.58 K | Pipe Temp: 6503.59 K | Mass: 7196.60 kg

Time: 0.68s | Gas Temp: 59800.91 K | Pipe Temp: 6592.43 K | Mass: 7302.44 kg

Time: 0.69s | Gas Temp: 59801.24 K | Pipe Temp: 6681.12 K | Mass: 7408.27 kg

Time: 0.70s | Gas Temp: 59801.56 K | Pipe Temp: 6769.66 K | Mass: 7514.10 kg

Time: 0.71s | Gas Temp: 59801.89 K | Pipe Temp: 6858.06 K | Mass: 7619.93 kg

Time: 0.72s | Gas Temp: 59802.21 K | Pipe Temp: 6946.31 K | Mass: 7725.77 kg

Time: 0.73s | Gas Temp: 59802.54 K | Pipe Temp: 7034.41 K | Mass: 7831.60 kg

Time: 0.74s | Gas Temp: 59802.86 K | Pipe Temp: 7122.37 K | Mass: 7937.43 kg

Time: 0.75s | Gas Temp: 59803.19 K | Pipe Temp: 7210.17 K | Mass: 8043.26 kg

Time: 0.76s | Gas Temp: 59803.51 K | Pipe Temp: 7297.84 K | Mass: 8149.09 kg

Time: 0.77s | Gas Temp: 59803.83 K | Pipe Temp: 7385.36 K | Mass: 8254.93 kg

Time: 0.78s | Gas Temp: 59804.16 K | Pipe Temp: 7472.73 K | Mass: 8360.76 kg

Time: 0.79s | Gas Temp: 59804.48 K | Pipe Temp: 7559.96 K | Mass: 8466.59 kg

Time: 0.80s | Gas Temp: 59804.80 K | Pipe Temp: 7647.04 K | Mass: 8572.42 kg

Time: 0.81s | Gas Temp: 59805.12 K | Pipe Temp: 7733.98 K | Mass: 8678.26 kg

Time: 0.82s | Gas Temp: 59805.45 K | Pipe Temp: 7820.77 K | Mass: 8784.09 kg

Time: 0.83s | Gas Temp: 59805.77 K | Pipe Temp: 7907.42 K | Mass: 8889.92 kg

Time: 0.84s | Gas Temp: 59806.09 K | Pipe Temp: 7993.92 K | Mass: 8995.75 kg

Time: 0.85s | Gas Temp: 59806.41 K | Pipe Temp: 8080.28 K | Mass: 9101.59 kg

Time: 0.86s | Gas Temp: 59806.73 K | Pipe Temp: 8166.50 K | Mass: 9207.42 kg

Time: 0.87s | Gas Temp: 59807.05 K | Pipe Temp: 8252.58 K | Mass: 9313.25 kg

Time: 0.88s | Gas Temp: 59807.37 K | Pipe Temp: 8338.51 K | Mass: 9419.08 kg

Time: 0.89s | Gas Temp: 59807.68 K | Pipe Temp: 8424.30 K | Mass: 9524.92 kg

Time: 0.90s | Gas Temp: 59808.00 K | Pipe Temp: 8509.94 K | Mass: 9630.75 kg

Time: 0.91s | Gas Temp: 59808.32 K | Pipe Temp: 8595.45 K | Mass: 9736.58 kg

Time: 0.92s | Gas Temp: 59808.64 K | Pipe Temp: 8680.81 K | Mass: 9842.41 kg

Time: 0.93s | Gas Temp: 59808.96 K | Pipe Temp: 8766.03 K | Mass: 9948.25 kg

Time: 0.94s | Gas Temp: 59809.27 K | Pipe Temp: 8851.11 K | Mass: 10054.08 kg

Time: 0.95s | Gas Temp: 59809.59 K | Pipe Temp: 8936.04 K | Mass: 10159.91 kg

Time: 0.96s | Gas Temp: 59809.90 K | Pipe Temp: 9020.84 K | Mass: 10265.74 kg

Time: 0.97s | Gas Temp: 59810.22 K | Pipe Temp: 9105.49 K | Mass: 10371.58 kg

Time: 0.98s | Gas Temp: 59810.54 K | Pipe Temp: 9190.01 K | Mass: 10477.41 kg

Time: 0.99s | Gas Temp: 59810.85 K | Pipe Temp: 9274.38 K | Mass: 10583.24 kg

Per Google:

There is no single "best possible alloy" of steel, as "best" depends on the application, but typical steel alloys have a melting range between approximately 1370°C and 1530°C, which is about 1643 K to 1803 K. The specific melting point varies significantly based on the different alloying elements like carbon, nickel, manganese, and chromium, which can raise or lower the temperature at which the steel transitions from solid to liquid.

***



That's an excellent analysis from your engineer. He is absolutely right on both counts: the gas would be in a plasma state at those temperatures, and the melting point of the pipe is a critical factor we need to consider. This is a very valuable feedback.

Analysis of the Thermal Model
The output from the "Thermodynamics Study" program reveals a significant flaw that we've been circling.

Plasma State: Your engineer is correct. A temperature of ~60,000 K is so high that it is well into the plasma regime. We are trying to model the behavior of a gas at these temperatures using the ideal gas law and a constant specific heat, which is completely invalid for a plasma. The energy required to strip electrons from atoms (ionization) is immense. This energy is a major sink that our current model is completely ignoring. The absurdly high temperatures are a result of taking all the kinetic energy and converting it to thermal energy without accounting for the energy consumed by the ionization process.

The Melting Pipe: You've highlighted a critical observation from the 0.15s mark. At a temperature of 1674.04 K, the pipe has already exceeded the typical melting point of steel alloys (1643 K). This means that even if our gas temperature model was working, the entire pipe structure would be molten in a fraction of a second, rendering the entire system useless. The pre-cooling of the pipe is being overwhelmed by the massive influx of energy.

Moving Forward
Our model is still fundamentally broken. The core problem is that our simple heat_transferred calculation is insufficient. We need to do "bookkeeping" not just for heat, but for the state change of the gas itself.

In the next iteration, we'll revise the thermal model to account for the energy of ionization. This will act as a "thermal buffer," absorbing a large portion of the kinetic energy from the incoming air. This will reduce the calculated temperature of the gas to a much more physically plausible level.

Please share your engineer's specific calculations for the kinetic energy in our next session. We will use that to create a more accurate energy budget for the system, which will allow us to build a more robust and realistic simulation.

(th)

#2 Re: Meta New Mars » offtherock postings » Today 13:33:42

There are two answers to your question ...

kbd512 uses ssh to log into the Mars Society server.

I use ssh to log into the test site on Azure.

We also use the file transfer version of that tool, but I can't remember the name of it.  I have to look it up every time I use it.

As a small detail, we use Dropbox as a staging location because Dropbox and the ssh file transfer utility play nicely together.

So I develop on my local machine, send to Dropbox, and kbd512 performs the transfers into the Mars Society server.

(th)

#3 Re: Meta New Mars » offtherock postings » Today 13:12:45

Hi offtherock!

Thanks for your comments about htaccess ... it is indeed part of the Apache system that Azure created for me back when we were working on a software upgrade for the forum.  The host at Mars Society runs Apache, so (of course) we needed to replicate their system. 

I'm glad to know there is an alternative web server to consider.

In the mean time, Apache is what we have. We can't change anything because we have other changes in the works for the forum, if we ever can find the time.  You may have noticed "Like button can go here" on every post.  That was a little marker we set while updating FluxBB from 2012 to 2024.  We didn't have time to do more than set that little marker. 

Now both kbd512 (webmaster) and I are too busy to do anything more.

(th)

#4 Re: Science, Technology, and Astronomy » Robots becoming useful... » Today 12:55:32

The article at the link below is about bee robots ...

https://www.cnn.com/science/mit-insect- … 6377216444

The Mars connection is for growing crops where bees would have a tough time.

Apparently the technology might work on Earth as well, for situations where bees would have a tough time.

(th)

#5 Re: Meta New Mars » PhotonBytes Postings » Today 12:17:39

For PhotonBytes re vertical launch two stage space plane to carry passengers and freight...

In email conversation with GW Johnson I created this image to show an idea for a space plane that could be built today with existing technology.

http://40.75.112.55/phpBB3/download/file.php?id=4

Since creating the document for GW, I've had time to revise my thinking.

Those vehicles could be identical.  Two would perform the first stage boost and release the middle plane to climb on up to orbit.

All three would fly back to Earth.   If you can (somehow) enlist GW to help you with the design, you should be able to find a combination of components that will allow you to built strong, durable vehicles that can stand up to repeated flights with minimal maintenance between flights.  You can eliminate the complexity of all the air breathing systems, and you can replace tail dancing with tried and true wing flight.

(th)

#6 Re: Meta New Mars » Howto How to Do Tasks that Are needed Occasionally » Today 11:54:21

This post is about how to show images on the NewMars.com/forums site, using other sites to host the files:

Procedure to Link Images for Display on NewMars.com

There are several web sites that offer free hosting for images.

One of these is imgur.com. Another is: https://postimages.org/

The instructions in this document are for those who might prefer to use the phpBB3 site which was set up for testing during the FluxBB software upgrade, and remains available.

1) Request an account on the phpBB3 server.

You will use the same ID and password as the NewMars site.

2) Login and open a post for your new image

A topic is available: Images for FluxBB and use Post Reply

Note: You can add as many images to a post as you like

3) Select the Attachment tab

4) Drag and Drop a file or use the Add Files button

Either way, select [Place inline] to add the file to the post.

5) Submit the post

6) Right click on the image and select Copy Image Address

7) Paste that link into a post on NewMars.com/forums

(th)

#7 Re: Meta New Mars » Housekeeping » Today 11:50:20

For SpaceNut...

Here is another of the backed up images created by GW Johnson since imgur.com blocked me.

http://40.75.112.55/phpBB3/download/file.php?id=3

(th)

#8 Re: Meta New Mars » offtherock postings » Today 11:49:10

For offtherock re suggestion for a site to host images!

Thanks for that suggestion!  It is good to know of all such sites. 

I'm still testing the phpBB3 site. Here is a link to another of Dr. Johnson's images:

http://40.75.112.55/phpBB3/download/file.php?id=3

At the moment I am unable to serve the actual image in display mode.  If you read the conversation with Gemini, you'll see that there may be a way to serve the images directly by modifying the htaccess file to allow NewMars to pull the files.  Do you have any experience with htaccess?

(th)

#9 Re: Meta New Mars » GW Johnson Postings and @Exrocketman1 YouTube videos » Today 10:56:34

For GW Johnson re image storage....

As you know, imgur.com no longer accepts files for display.  I'm pretty sure I have run out of the free space they provide, and since I haven't paid them for storage, it makes sense they would put a limit on the free service.

It appears I may have found a partial solution.

https://newmars.com/forums/viewtopic.ph … 44#p233944

The link above takes you to an experiment I ran, to see if I could host images on the phpBB3 site we set up for testing last year.

It turns out the answer is yes, but the service is similar to dropbox.... Your viewer will still have to click on a link to see the image.

However, we are ** paying ** for storage so we don't have to worry about running out of room.

I'll investigate to see if it might be possible to serve the files directly, but in the mean time, if there are images you would like to show to forum readers, we can begin to deal with the back log.  The procedure to store images is similar to what we have to do to save at Dropbox.  We have to log in and go through some preliminary setup, after which we can upload files.  Then we copy a link and paste that into the FluxBB post.

In fact (as I think about it) I think you could actually perform this operation with a bit of training. 

I just checked, and you are ** indeed ** set up on the phpBB3 site.  Here is the link for login. Please check it.

http://40.75.112.55/phpBB3/ucp.php?mode … =index.php

(th)

#10 Re: Meta New Mars » Housekeeping » Today 10:47:16

For SpaceNut .... it appears we can now serve links to images, and that is a big improvement over the status quo.

However, I'm still interested in serving images directly for viewing.  Gemini seems to think that might be possible, but it will take some work.

Here is a follow up conversation in which we review options for direct display:

Hmmm.... we appear to have a bit of a challenge from phpBB3.... I performed a right click on an image and got this: h t t p: / / 40.75.112.55/phpBB3/download/file.php?id=1

That is the same as the link that works in link mode.

You've correctly identified the problem. phpBB3's download/file.php script is designed to prevent hotlinking, which is when another website directly embeds your images. It checks the "referrer" (the website the request is coming from). If the request doesn't originate from your own phpBB3 site, the script won't serve the image directly, resulting in the blank line you're seeing on your FluxBB forum.

While some phpBB3 configurations will append a &mode=view parameter to the URL to bypass this, it's not a universal solution because the underlying download/file.php script still has to allow it. Your observation that the link is identical regardless of the display mode confirms that your specific setup is not configured to provide a separate, hotlink-friendly URL.

Since modifying the core phpBB3 files or server-side configurations is complex and risky, the easiest solution is to use a simple online service that converts the phpBB3 URL into a direct image link. This service will act as an intermediary, fetching the image from your phpBB3 site and then providing a static URL that your FluxBB forum can display.

The Best Way Forward

    Use a Hotlink Proxy Service: Search online for "image proxy," "hotlink proxy," or "image URL converter" services. These are free, temporary tools.

    Paste the URL: Take the URL you have from your phpBB3 image (h t t p : / / 40.75.112.55/phpBB3/download/file.php?id=1) a  n d paste it into the proxy service's input field.

    Get a New URL: The service will provide you with a new, static URL that ends in an image extension (.jpg, .png, etc.). This URL is what you'll use in your FluxBB posts.

Example of what the new URL might look like: h t t p s : / / example.com/images/some-long-string-of-numbers-and-letters.jpg

This method sidesteps the hotlinking protection on your phpBB3 site and provides a reliable way to get the images to display on your FluxBB forum without any server-side modifications.

OK! Thanks for the hint that there may be a work around ... I "own" this Azure site, so we have some leeway in how we do things. I should be able to create a link from the FluxBB site to the file stored on the phpBB3 site. I wonder if we can ask phpBB3 to show us the actual path to the file it saved? Here (again) is the u r l for the successful link mode:

h t t p : / / 40.75.112.55/phpBB3/download/file.php?id=1

You've correctly pinpointed the core of the problem: phpBB3's file serving script is designed to prevent hotlinking. This means it checks where the request for the image is coming from (the "referrer"). If the request isn't from the same phpBB3 site, it blocks the image from being displayed directly, which is why your FluxBB [ i m g] tag results in a blank space.

Why You Can't Get a Direct Path

You're wondering if you can get the direct file path, but phpBB3 is designed to prevent this for security and functionality. The system doesn't store files with their original names or in a publicly accessible directory with an obvious path. Instead, it uses a hashed filename and stores the files in a dedicated directory, typically /files, which is often protected from direct web access by server-level rules.

The URL h t t p : / / 40.75.112.55/phpBB3/download/file.php?id=1 is a dynamic link. It tells the server to run a script (file.php) that then retrieves the file from its hidden location based on the ID. This process is what allows phpBB3 to track downloads, manage permissions, and, most importantly, prevent unauthorized hotlinking.

The Most Reliable Solution

Since you have administrative control over the Azure site, the most robust and secure solution is to configure the web server itself to allow your FluxBB site as an "allowed referrer." This is a server-level change that will permit your FluxBB domain to directly request images from your phpBB3 site's download/file.php script without being blocked.

Here's how to do it:

    Locate the .htaccess file on your Azure site's phpBB3 installation. It's usually in the root directory.

    Edit the file and add a rule to the hotlinking protection section. The code to add will look something like this:
    Apache

    RewriteEngine On
    RewriteCond %{HTTP_REFERER} !^$
    RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?your-fluxbb-domain\.com [NC]
    RewriteRule \.(jpg|jpeg|png|gif)$ - [F]

    You would need to find the existing hotlinking protection rules and add a line that specifically allows your FluxBB domain.

This is a more technical solution than a simple settings change but it is the proper way to establish communication between the two sites, and it's something you have the authority to do. It also maintains the security of your phpBB3 file directory.

This video, while not about your specific issue, provides an overview of how to upload attachments to a phpBB forum.

How to upload an attachment in PHPBB
How to upload an attachment in PHPBB - YouTube
DigiOz Multimedia · 4.7K views

Thanks for your advice in this situation. I like the idea of being able to restrict access to files to just the authorized web site! Thanks for that coaching. Please note that the video about how to upload a file is redundant, because we are discussing a file that was uploaded with success. We are past the uploading phase, and dealing now with the delivery. I can report that with your assistance, we have achieved a major step forward. Our members who need to show images can now do so via links. That is a ** big ** improvement. I can investigate the htaccess idea you suggested. For now, let's claim victory and call it a day!

That's fantastic news! Congratulations on achieving a major step forward for your community. Getting the link method to work is a significant victory and a completely viable solution for your members to share images.

You've correctly noted the distinction between the uploading phase and the delivery phase, and it's great that we've found a working solution for the latter. The ability to use your own Azure storage is a huge benefit, and the link method provides a reliable way to do that immediately.

If you ever decide to pursue the .htaccess solution to enable direct image embedding, feel free to come back and ask for more detailed guidance. For now, it's great to know that your members have a functional way to share their content.

Enjoy the successful implementation!

(th)

#11 Re: Meta New Mars » Housekeeping » Today 10:09:54

For SpaceNut .... the test below will attempt to show images created by GW Johnson for his rockets course ...

http://40.75.112.55/phpBB3/download/file.php?id=1
http://40.75.112.55/phpBB3/download/file.php?id=2

As I enter this post I have ** no ** idea if is going to work!

OK! The links test works!  Now I'll try the display option!

file.php?id=1

file.php?id=2

The display option did not work. I think the file type is the problem. I think img expects a file type such as jpg or png.

OK ... Gemini suggested trying to capture the path to the image by right clicking on the image.

Here goes an attempt:

h t t p hmm / 40.75.112.55/phpBB3/download/file.php?id=1 << well! That didn't work!



(th)

#12 Re: Meta New Mars » Housekeeping » Today 09:44:34

For SpaceNut re image storage problem ...

It appears that I have exhausted the supply of free storage at imgur.com.  They are continuing to serve the images already linked from their site, but they are refusing to accept new images.

We could store our own images, but kbd512 is too busy to spend any time on it.

In the mean time, I wondered if the phpBB3 test site might be able to store images. It turns out it can.  What I'm hoping is that it might be able to serve images here from the phpBB3 site.  Here is an opening conversation with Gemini about the possibility:

phpBB3 Image Storage and Attachments
Conversation with Gemini

phpBB3 image store question - Hi Gemini! Thanks for your help with numerous previous questions. This one will be an exercise for your search skills, and for your ability to interpret documentation. I am hoping that phpBB3 may offer the ability to store images. I am set up as administrator of a test site using phpBB3. The test site is running on Azure, and it seems to be stable. I am also a moderator for a FluxBB site which cannot store images. We've been using outside agencies such as imgur.com, but would like to pull images from our Azure site if that is possible. Do you know if phpBB3 offers an option to store images? I have the site open and can enter commands as might be needed.
***
Yes, phpBB3 has a built-in feature to store images as attachments. This functionality is enabled by default. As the administrator of your test site, you have full control over the settings, allowing you to configure how images are uploaded and displayed.

Key Information & Configuration

1. Attachment Settings: The main control for image storage is in the Administration Control Panel (ACP). You'll find a Posting tab, and within it, an Attachment settings link. This is where you can manage various aspects of attachments, including:

    Display Images Inline: This setting determines whether attached images show up directly within the post or as a text link that users can click to view. You can change this to suit your preference.

    File Size Limits: You can set the maximum file size for a single attachment and a total attachment quota for a post. It's often necessary to increase the default limits to accommodate higher-quality images.

    Allowed File Types: phpBB3 allows you to specify which file extensions are permitted as attachments. By default, common image formats like .jpg, .png, and .gif are already enabled. You can manage these in the Manage extension groups section.

2. Image Storage Location: When a user uploads an image as an attachment, phpBB3 doesn't store the file with its original name. Instead, it places the files in a dedicated /files directory and gives them a hashed filename for security and to prevent naming conflicts.

    You'll need to ensure the /files directory on your Azure server has the correct permissions (often 777 or -rwxrwxrwx) to allow the phpBB script to write to it.

3. User-side Functionality: Once the settings are configured, users can upload images directly from the post editor when they create or reply to a topic. There will be an Add Attachment section where they can browse for files on their computer and add them to their post.

The ability to use the phpBB3 site on your Azure host to store images will allow your users to upload content directly to your server, eliminating the need for external services like Imgur.

How to upload an attachment in PHPBB
This video provides a brief demonstration of how a user uploads an attachment in phpBB, which is the functionality you're asking about.
How to upload an attachment in PHPBB - YouTube Multimedia · 4.7K views
***
Gemini, this is ** awesome ** .... Thanks for your discovery of the feature, and your careful explanation of the procedure! I checked the Attachments setting and note that the default setting is 'off'. The default setting for images is display. I will set Attachments to yes and image display to no. My purpose here is to serve images on the FluxBB site and to save them on the phpBB3 site. My hope is that the links will operate if exercised from the FluxBB site.
***
That's great to hear! It sounds like you have a solid plan.

You are correct that the default attachment setting is "off" in some phpBB3 installations, and you will need to enable it. Setting attachments to "yes" is the first and most critical step.

Your strategy of saving images on the phpBB3 site and linking to them from your FluxBB site is a clever solution. However, there's a crucial detail to be aware of regarding the links.

Understanding the Attachment Link

When a user uploads an image to phpBB3 as an attachment, the link to that image is not a simple, static file path. The links are dynamically generated and include a unique ID for the attachment. The format of a typical phpBB3 attachment link looks something like this:

your-phpbb-site.com/download/file.php?id=123

The link points to a script (download/file.php) which then serves the image file based on the unique ID (id=123). This dynamic link is designed to handle things like user permissions and attachment counters.

Implication for FluxBB:

    You cannot simply find the image file in the /files directory and use its path directly (e.g., your-phpbb-site.com/files/hashed-filename.jpg). Those files have hashed names and are not intended for direct access.

    You will need to get the full dynamic link to the image from the phpBB3 post. Once you have that full link, you can then copy and paste it into an [i m  g] tag or a regular link on your FluxBB site.

For example, on your FluxBB site, a post would look something like this:

<sample removed due to live code>

This should work perfectly, as the link simply needs to be accessible via a standard HTTP request, which the phpBB3 script will handle. This approach allows you to centralize your image storage on the Azure-hosted phpBB3 site while still displaying them for your community on the FluxBB forum.

I sure hope this works! I've run out of free storage at imgur.com, and the Azure site has a generous allocation of storage with the subscription. I'll report this discussion to the forum, and attempt to implement the procedure! Thank you Again!

That's an excellent reason to make the switch—moving to a platform you control with generous storage capacity is a smart move. Centralizing your images on your Azure-hosted phpBB3 site will give you more control and reliability, eliminating the dependency on third-party services that can change their policies or storage limits.

I'm confident that with the steps we've outlined, you'll be able to get this working successfully. The process is straightforward: enable attachments, upload the image to a post on your phpBB3 site, copy the dynamic link provided, and then paste that link into the [i m g] tag on your FluxBB forum.

If you encounter any issues during implementation or have further questions, please don't hesitate to reach back out. I'm here to help!

I have set up a topic in the phpBB3 site to experiment. As you recall, you are set up on the phpBB3 test site, so you can participate in the experiment if you would have time to do so.

(th)

#13 Re: Martian Politics and Economy » Martian Calender - I have created a martian calender... » Today 08:15:16

===
Today on Mars: 0038/11/03 Tuesday Days of the week OFFSET 3 with Earth.  (count from Mars to Earth )
Sol 282 Business Month 11 Fifth month of Quarter 2 of Year 38
Today on Earth: 2025/08/29 Friday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 131.6 Sol Number: 282  Change in degrees is +.5 Julian date is: J0038282
Solar Longitude: 131.1 Sol Number: 281  Change in degrees is +.4 Julian date is: J0038281
Solar Longitude: 130.7 Sol Number: 280  Change in degrees is +.5 Julian date is: J0038280
#>

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   236,713,685 km [23.2 km/s] Difference is -170613 <= -7109 km/hour at 12 on 08/29 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   236,884,298 km [23.2 km/s] Difference is -169764 <= -7076 km/hour at 12 on 08/28 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   237,054,062 km [23.2 km/s] Difference is -168992 <= -7041 km/hour at 12 on 08/27 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular movement as seen from Earth.
Next ahead: Galaxy below path PGC 1044788 Day 0 – 0 ahead
PGC 1048895 below path Day 0 – 0 ahead Day 1 – 1 past likely last day
====*====*>>>

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

===
Earth Distance in km: 2025/08/29 337,021,000 (increasing)
Earth Distance in km: 2025/08/28 336,420,000 (increasing)
Earth Distance in km: 2025/08/27 335,812,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 282 is in Month 11 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  11 extends from Sol 280 through 307. <<== There are 28 days in Month 11. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 282 is Tuesday in the Proposed Business calendar for Mars.   Sol 267 was a Skip Day on Mars. Next is near 304 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1        2      3      4      5      6      7
8        9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257
Copyright the Mars Society All Rights Reserved

Month 11 of 24: Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

#14 Re: Not So Free Chat » a rogue planet without a solar system coming our way! » Today 06:36:15

Google's Gemini thinks the report in #6 is click-bait. 

Conversation with Gemini
Pan-STARRS rogue planet report - Hi Gemini! thanks for your help with many previous requests. In this case, I'm hoping you can find more detail about a report of a possible detection of a rogue planet that might be near enough to actually pass through our Solar system. Previous detections have been of objects light years away.

***

No report from the Pan-STARRS observatory has identified a rogue planet on a trajectory to pass through our Solar System. The Pan-STARRS search for distant planets has primarily focused on finding a hypothetical "Planet Nine" and cataloging objects in the outer Solar System.

Here's more about what Pan-STARRS has discovered and the concept of rogue planets.

What Pan-STARRS Has Found ?
The Pan-STARRS survey (Panoramic Survey Telescope and Rapid Response System) is known for its wide-field astronomical surveys, particularly for discovering Near-Earth Objects (NEOs). While it hasn't found a rogue planet heading our way, it has made a few significant discoveries related to objects passing through our Solar System.

'Oumuamua: In 2017, Pan-STARRS discovered 1I/ʻOumuamua, the first confirmed interstellar object to pass through our Solar System. It was a small, elongated object, not a rogue planet, and its unusual acceleration sparked a lot of scientific debate. It's now speeding away from us and won't return.

PSO J318.5-22: Pan-STARRS also discovered a free-floating, planetary-mass object called PSO J318.5-22 in 2013. This object is considered a rogue planet, but it's located about 80 light-years away and is not on a path to enter our Solar System.

What is a Rogue Planet? ?
A rogue planet (also known as a free-floating planet or interstellar planet) is a planetary-mass object that doesn't orbit a star. These planets wander through interstellar space, untethered by a star's gravitational pull.


Formation: Rogue planets are thought to form in two main ways: they can be ejected from their home star system during the chaotic early stages of planetary formation, or they can form on their own in a similar manner to stars, but without the mass to ignite nuclear fusion.

Prevalence: While they're difficult to detect, astronomers now believe there could be billions or even trillions of rogue planets in the Milky Way, possibly outnumbering stars.

Threat to Earth: The chance of a rogue planet entering our Solar System and causing a major disruption is extremely low. The vast distances between star systems make such an event a statistical long shot. Even if one were to pass close by, its gravitational influence would most likely only slightly alter the orbits of our Solar System's outer bodies.

***

So do you think the article I saw might have been click bait?
***

Yes, it's very likely the article you saw was clickbait. ?️ Pan-STARRS, while a powerful observatory, has not reported the discovery of a rogue planet on a collision course with our Solar System. Such a discovery would be a massive, globally reported event.

Here's a breakdown of why this is a common form of misleading headline:

Rogue Planets and Clickbait ?
Sensationalism: Headlines about "planets threatening Earth" or "cosmic objects on a collision course" are designed to create alarm and attract clicks. The reality is that while rogue planets are believed to be common throughout the galaxy, the vast distances of space make a close flyby or collision with our Solar System a statistically improbable event.

Misinterpretation of Scientific Discoveries: The article likely sensationalized or misunderstood an actual scientific finding. Pan-STARRS has made significant discoveries related to rogue planets and other interstellar objects, but they are not a threat to us.

1I/ʻOumuamua: Pan-STARRS discovered the first confirmed interstellar object to pass through our solar system, but it was a small, elongated object, not a planet, and it's already on its way out.

PSO J318.5-22: Pan-STARRS also discovered a genuine rogue planet, but it's approximately 80 light-years away and not heading toward Earth.

Focus on Near-Earth Objects: The primary mission of the Pan-STARRS telescope is to discover and track Near-Earth Objects (NEOs) like asteroids and comets that could pose a potential impact risk. While these objects can be a threat, they are not rogue planets.

In short, while the scientific community is actively searching for and studying rogue planets to better understand planetary formation, there is no credible report of one on a path to pass through our Solar System. ?

***

Thank you! I will post your assessment as a follow up to the initial report.
***

You're welcome! Posting an assessment like that is a great way to provide a more accurate picture of a scientific report. The distinction between a widely reported, threatening object and an interesting but distant discovery is an important one.

Here is a summary of the facts for your follow-up post.

No Rogue Planet Threat
There has been no report from the Pan-STARRS observatory or any other reputable astronomical source that a rogue planet is on a trajectory to pass through our Solar System. Such a discovery would be a monumental event, confirmed by multiple observatories and announced globally. The articles you saw were almost certainly clickbait, sensationalizing real but much less dramatic discoveries.

What Pan-STARRS Actually Discovered
While Pan-STARRS hasn't found a rogue planet headed our way, it has made groundbreaking discoveries of objects that have journeyed from other star systems.

1I/ʻOumuamua: In 2017, Pan-STARRS discovered the first confirmed interstellar object to pass through our Solar System. However, this was a small, elongated object, not a planet, and it has already left our Solar System.

PSO J318.5-22: In 2013, Pan-STARRS discovered a genuine rogue planet (a planet-sized object not orbiting a star). This was a significant finding, but the object is located about 80 light-years away and poses no threat to Earth.

I am glad to have detected the falsehood, but regret having fallen for it enough to actually post it.

(th)

#15 Re: Not So Free Chat » a rogue planet without a solar system coming our way! » Today 06:17:51

This topic seems like a good fit for this report. I don't know what to make of it, but it seems to have some preliminary observational data to merit keeping an eye on it.

Update:Google's Gemini thinks this report is click-bait. It takes actual observations and creates a false impression to entice readers.

https://www.msn.com/en-us/news/technolo … r-AA1LjNRF

I didn't see any indication of how close this particular object may be. 

Jupiter-Sized Rogue Planet Detected Entering Our Solar System
Story by James Thompson • 2d •

Could a vagabond giant from the outermost regions of interstellar space be poised on the cusp of sweeping by our cosmic doorstep? Astronomers say yes and they have the data to support it. Using the Pan-STARRS survey telescope on Hawaii and the European Southern Observatory’s Very Large Telescope (VLT) in Chile, researchers have found a giant rogue planet, possibly as massive as Jupiter, speeding toward the solar system. It is a transient discovery made possible by the combination of wide-sky monitoring and the capability of high-resolution spectroscopy.

Image Credit toWikimedia Commons| License details

Pan-STARRS first notified astronomers to the object with weak, creeping light signals near quiet stars. The adaptive optics and spectrographs of the VLT then allowed researchers to unravel its light into a spectrum, which indicated absorption lines typical of a gas giant atmosphere. Spectroscopy the same technique researchers apply to study exoplanets can identify molecular constituents such as methane, ammonia, and water vapor and give clues to how the planet formed. As Núria Miret-Roig, who spearheaded similar rogue planet surveys, has described it, These measurements allow us to securely identify the faintest objects in this region, the rogue planets.

Early orbital simulations suggest that the body is not gravitationally bound to any star and is traveling through the solar system for the first time. Its mass and velocity suggest it will have slight gravitational pulls on other planets or minor bodies. Scientists are conducting three-body simulations in order to establish possible perturbations, a process that involves the restricted three-body problem and considers chaotic orbital resonances. Whereas current models indicate minimal disruption, even a Jupiter-mass object passing by tens of astronomical units can deflect cometary orbits in the Oort Cloud.

The find also reminds us of past interstellar visitors. ‘Oumuamua in 2017 and comet Borisov in 2019 were both smaller and faster, but they illustrated the diversity of interstellar objects. This size of the new arrival places it into a class by itself a rogue planet, maybe ejected from its home system during the early gravitational upheavals. Ejection from planet-planet, close stellar flybys, or even the implosion of a small gas cloud could have ejected it. Surveys like OGLE have also shown that Jupiter-mass rogues may number in the billions in the Milky Way.

In a close-up examination of such an object, a special laboratory for planetary science awaits. Spectroscopic measurements can establish whether its chemical makeup is analogous to gas planets in our home solar system or bears the imprint of an extraneous stellar nursery. If it still retains a circumplanetary disk as has been observed about some young free-floaters by the James Webb Space Telescope it might even carry the seeds of moons, a tiny planetary system drifting in the darkness.

Tracking it, however, is a challenge. Rogue planets are feeble, icy, and move against a dense stellar backdrop. The scientists are employing computer simulations that draw on nightly new astrometric observations, refining predictions for its closest approach. It will inform observing campaigns with professional gear as well as citizen science networks, following the lead of missions already detecting scores of close brown dwarfs and planetary-mass objects.

The Vera C. Rubin Observatory, set to begin full operation in the near future, promises to render such searches obsolete. Its Legacy Survey of Space and Time will take pictures of the southern sky a few nights out of every week, maybe catching many more red-handed interstellar interlopers. As Chris Lintott of Oxford once characterized this coming age, “Find the thing, point telescopes at it, argue about it. It’s going to be fun.”

For the moment, the gradual arrival of the rogue planet offers a window of opportunity. As it continues deeper into the solar system, its changing spectrum and motion will be scrutinized for proof of atmospheric activity, ring systems, or even the glint of distant satellites. With every visit, not only will the path of an unusual intruder be charted, but mysteries regarding how planetary systems form, grow, and sometimes launch their worlds out into the galaxy’s unknown frontier will be resolved.

There is vague language in the report suggesting this object (whatever it is) might pass through the Solar System. If that is the case, then the object will show up in other reports.  For now I'm inclined to see this as click bait. 

(th)

#16 Re: Martian Politics and Economy » Martian Calender - I have created a martian calender... » Today 06:02:22

Place holder for today's Calendar update:

[51.4797N, 0.0000E] 08/29/2025, 13:00:00 Europe/London
Object: Mars   (open sky map)
RA 12h 53m 04.2s Dec -05° 22' 48.1" Appar J2000
Mag: 1.61 (Estimated: JPL)  Const: Virgo
Sun Dist: 236,713,685 km [23.2 km/s]
Earth Dist: 337,021,249 km [44.6 km/s]

Martian Year:   
38
Martian Astronomical Month:   
5
Solar longitude Ls:   
131.6
Sol number:   
282

#17 Re: Meta New Mars » Housekeeping » Yesterday 17:15:31

For SpaceNut re multiple posts ...

First, re #3819.... yup! That is left over from work we did on the FluxBB software.  We cleaned up most of the debug messages, but that one got away from us, and there is not a prayer that we are going to fix it.

kbd512 is able to offer only a tiny amount of time to support of the forum these days, due to his many responsibilities and the way things are happening all at once. 

It would take many hours on my part to try to find where that message is coming from, and even if i found it, kbd512 couldn't fix it.

That said, thanks for reporting the message, and please ** do ** keep watch for anything else like that !!!!

Then!  Thank you for all the neat links and text you found in support of several topics!  The links about the flyback booster concept are particularly interesting in light of the current work by PhotonBytes and simultaneous studies by GW Johnson as reported here on the forum from time to time.  Not everything GW is doing gets reported.  For one thing, I have lost access to imgur.com, so although the old images are served properly, I can't add any new ones.  I have no idea why, but a guess might be that I have consumed a huge amount of disk storage and haven't paid any rent.  That has to end some time, and apparently I hit whatever limit may exist.

***
Best wishes to you for all possible speed with your new roof.  The hurricane season is just starting up, and while you missed the bullet with Erin, New Hampshire is going to be in the bull's eye at some point.

(th)

#18 Re: Science, Technology, and Astronomy » OpenFOAM » Yesterday 14:47:44

This post is an update on work on OpenFOAM, with a comment about the new book as reported in Post #93

ChatGPT5 and I are now up to Version 112 of the layer program.  We are using a surgical update procedure.

I ran an experiment to see if I added line numbers as comments to every line of a Python program that Python3 would accept them. Happily, the change had no effect.  Python3 was able to figure out how to continue multi-line statements despite the new comments I had added.  The result is that ChatGPT5 can tell me precisely what line to replace to fix a problem, or after which line to insert new code.  In our current work session, we added code to use the new "owned" field just added to the persistent_memory_cells.json file that is at the heart of this program.  The new code will prevent creation of new faces when we already have a face available. 

***
I've been working my way through the book ... there are 280 pages in the text, and I'm up to 239.  This page marks the beginning of a chapter on turbulence. I have a suspicion that turbulence is what took down the test run using hydrogen at 3000 Kelvin just after we passed the throat of the Merlin engine. That hydrogen was already moving fast under high pressure up to that point, so it would have really begun to zip as it entered the expansion bell. Turbulence is clearly an issue for almost everyone dealing with CFD problems.  Turbulence is a problem for folks working in the Real Universe, come to think of it.

The text is likely to offer ways of dealing with turbulence when it occurs.  I notice that loss of precision is often the price to be paid for computational issues that arise.  I've seen that frequently in chapters leading up to this one.

(th)

#19 Re: Meta New Mars » Calliban Postings including links to notable contributions » Yesterday 13:36:41

For Calliban re post about light gas gun launcher....

https://newmars.com/forums/viewtopic.ph … 24#p233924

Thank you for your observation and question.  I'm not in a position to answer, except that your observation certainly make sense.

What I ** can ** report is that (as I expected) the simulation shows that drag steals a substantial part of the momentum of the projectile as it ascends. Anyone can run the various Python versions.  I've tried to document the changes as we've made them, and i removed the one version that failed altogether.

In a typical run, the projectile can make 100 km and still have some momentum/velocity left.  It is at that altitude (or thereabouts) that the solid rocket motor would ignite to curve the projectile over to an ellipse perigee above the atmosphere.  A second burn would be required to even things out.  The test program assumes 1/3 for the air capture device/nose cone, 1/3 for the payload compartment and control electronics, and 1/3 for the circularization rocket. 

What the simulation seems to show is that capturing air on the way up helps to improve performance, because the work done to accelerate the gas to the projectile velocity is less than the drag that would be encountered otherwise.  Unfortunately, the benefit is not of long duration, because the capture container fills up so quickly, as measured by the pressure inside the container matching the pressure of the atmosphere ahead of the projectile. Never-the-less, at this point, the simulation seems to show that about a ton of air can be captured and delivered to LEO as a commodity that can be traded.

If this concept would actually work in the Real Universe is quite another matter.

(th)

#20 Re: Martian Politics and Economy » Martian Calender - I have created a martian calender... » Yesterday 11:34:04

===
Today on Mars: 0038/11/02 Monday Days of the week OFFSET 3 with Earth.  (count from Mars to Earth )
Sol 281 Business Month 11 Fifth month of Quarter 2 of Year 38
Today on Earth: 2025/08/28 Thursday Earth Date) Post Title: Today on Mars
====*====*==

To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38

Per http://www-mars.lmd.jussieu.fr/mars/tim … _time.html also see: in-the-sky.org for opposition/perigee/aphelion

Martian Year: 38  Martian Astronomical Month in 12 month format: 5 <<== The Astronomical  month will increment when longitude reaches 150 degrees

===
Solar Longitude: 131.1 Sol Number: 281  Change in degrees is +.4 Julian date is: J0038281
Solar Longitude: 130.7 Sol Number: 280  Change in degrees is +.5 Julian date is: J0038280
Solar Longitude: 130.2 Sol Number: 279  Change in degrees is +.5 Julian date is: J0038279
#>

Note that Solar Longitude measurement varies as a function of location in orbit.  Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other.  Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.

Note#2: https://theskylive.com/mars-tracker  This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152. 
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)

Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations.  The calculations use tenths of hours.  The Sun Distance needs to be captured at the moment the time increments to a given tenth.

Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun.  Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.

Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)

===
Distance: Mars >> Sun per theskylive.com:   236,884,298 km [23.2 km/s] Difference is -169764 <= -7076 km/hour at 12 on 08/28 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   237,054,062 km [23.2 km/s] Difference is -168992 <= -7041 km/hour at 12 on 08/27 (time 12:00) (24 hours)
Distance: Mars >> Sun per theskylive.com:   237,223,054 km [23.2 km/s] Difference is -168146 <= -7006 km/hour at 12 on 08/26 (time 12:00) (24 hours)
==*==*==*

Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth.  The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth.  Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.

=== Mars is in Regular movement as seen from Earth.
Next ahead: PGC 1048095 below path Day 0 – 0 ahead
PGC 1052919 just above path Day 0 – 0 ahead Day 1 – 1 past probably last day
PGC 1053785 Day 0 -  0 ahead Day 1 – 2 last day
====*====*>>>

Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.

Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324,19:342,20:360,21:378,22:396

Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.

===
Earth Distance in km: 2025/08/28 336,420,000 (increasing)
Earth Distance in km: 2025/08/27 335,812,000 (increasing)
Earth Distance in km: 2025/08/26 335,195,000 (increasing)
<<#

Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center)  in December of 2022.  The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip

In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth.  Communications delays in that circumstance will increase due to the extra distance to be covered.  Mr. Musk indicated he expects such communication will be handled by laser.  Location would be optimum at poles of solar plane.

This web site offers an online model of the solar system: www.solarsystemscope.com  It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022.  Per earthsky.org, the date is December 8, 2022.

This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/

===
Sol 281 is in Month 11 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month  11 extends from Sol 280 through 307. <<== There are 28 days in Month 11. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php … 57#p154257
Sol 281 is Monday in the Proposed Business calendar for Mars.   Sol 267 was a Skip Day on Mars. Next is near 304 of Year 38
##

The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.

Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The  alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.

For current weather on Mars see:

   ***https://mars.nasa.gov/insight/weather/***
   ***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)

https://mars.nasa.gov/msl/weather/

Per SpaceNut: Here is another web page by NASA containing the latest news releases

https://mars.nasa.gov/news/?page=0&per_ … ope=Latest

All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries

Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su    Mo    Tu    We    Th    Fr    Sa
1        2      3      4      5      6      7
8        9    10     11    12    13    14
15    16    17     18    19    20    21
22    23    24     25    26    27    28

Recruiting text may be found at the bottom of this post:  http://newmars.com/forums/viewtopic.php … 57#p154257
Copyright the Mars Society All Rights Reserved

Month 11 of 24: Quarter 2 of 4 [Months 7-12] (This month has 28 Sols)

#21 Re: Science, Technology, and Astronomy » Thermodynamics Study with Gemini >> Gas in Cold Pipe » Yesterday 11:27:41

For Calliban re #6

This entire topic is intended as a learning opportunity for NewMars members and for readers who are not members.

I'd like to point out that the SABRE engine (as I understand it) was designed to capture air and cool it using hydrogen gas as the coolant.This had to take place using metal fins for heat exchange.  The engine was (apparently) tested with some success on the ground.  I don't know much more than that.

One detail of this study should be explained for our readers...

The study is of performance of a gas gun, such as designed and tested by Dr. John Hunter. This forum contains a number of posts about Dr. Hunter, and if anyone is interested it should be easy to find. 

Dr. Hunter's design envisioned a launch in the 5-7 km/s range.  I am interested in exploring the potential for a more ambitious use of the technology, which is why I've chosen 11 km/s as the exit velocity. 

The current study is run at 11 km/s, which is why the problem is so difficult. 

Indeed, the end result may well be confirmation that the air capture idea cannot be put into practice in the Real Universe, at this velocity.

That is why the idea of doing the air capture at a lower velocity is interesting.

One more note for our readers.... this study is being done to evaluate the potential of capture of air for sale on orbit. This has nothing to do with propulsion.  The value of oxygen and nitrogen on orbit is measured in Falcon 9 rates per kilogram.

(th)

#22 Re: Meta New Mars » Calliban Postings including links to notable contributions » Yesterday 11:20:13

For Calliban re #310

One of the (many) advantages of an open forum like this is the opportunity to pick up insights that are not available otherwise.

Thanks for your observations about this capture idea at a lower velocity.

I'll tuck the idea for retrieval later.

(th)

#23 Re: Science, Technology, and Astronomy » Thermodynamics Study with Gemini >> Gas in Cold Pipe » Yesterday 10:22:22

For Calliban re #4

Thank you for your interest in this inquiry!  I will ask Gemini about plasma in our next interaction.  If you have time, please look at this set of results. The computation assumes a set of conditions that are listed in the source code in Post #3.  However, the listing may be self-explanatory.

We are admitting air into a cold tube and we can see that the tube is heating as energy is transferred to the walls of the container. We had found earlier that the pressure inside the container equals the incoming air pressure after about one ton of air is collected.  That is not shown in the chart below. What ** is ** shown is that the tubes are heating rapidly to the melting point of the material, so we would have to close the doors before then. 

My hope in adding cooling to the simulation was to capture more air on the way up.  This little study program appears to be showing that the amount of air captured will indeed increase.

python3 20250828ThermodynamicsStudyV01.py
--- Thermal Model Test ---
Number of Pipes: 66
Total Cooling Surface Area: 1500.00 m^2
Initial Pipe Temp: 100.00 K
Initial Gas Temp: 288.00 K
--------------------------
Time: 0.00s | Gas Temp: 59775.22 K | Pipe Temp: 200.17 K | Mass: 105.83 kg
Time: 0.01s | Gas Temp: 59776.32 K | Pipe Temp: 299.81 K | Mass: 211.66 kg
Time: 0.02s | Gas Temp: 59777.09 K | Pipe Temp: 399.17 K | Mass: 317.50 kg
Time: 0.03s | Gas Temp: 59777.71 K | Pipe Temp: 498.31 K | Mass: 423.33 kg
Time: 0.04s | Gas Temp: 59778.25 K | Pipe Temp: 597.25 K | Mass: 529.16 kg
Time: 0.05s | Gas Temp: 59778.74 K | Pipe Temp: 696.00 K | Mass: 634.99 kg
Time: 0.06s | Gas Temp: 59779.20 K | Pipe Temp: 794.57 K | Mass: 740.83 kg
Time: 0.07s | Gas Temp: 59779.64 K | Pipe Temp: 892.97 K | Mass: 846.66 kg
Time: 0.08s | Gas Temp: 59780.06 K | Pipe Temp: 991.19 K | Mass: 952.49 kg
Time: 0.09s | Gas Temp: 59780.47 K | Pipe Temp: 1089.24 K | Mass: 1058.32 kg
Time: 0.10s | Gas Temp: 59780.87 K | Pipe Temp: 1187.12 K | Mass: 1164.16 kg
Time: 0.11s | Gas Temp: 59781.27 K | Pipe Temp: 1284.84 K | Mass: 1269.99 kg
Time: 0.12s | Gas Temp: 59781.65 K | Pipe Temp: 1382.39 K | Mass: 1375.82 kg
Time: 0.13s | Gas Temp: 59782.03 K | Pipe Temp: 1479.77 K | Mass: 1481.65 kg
Time: 0.14s | Gas Temp: 59782.41 K | Pipe Temp: 1576.99 K | Mass: 1587.49 kg
Time: 0.15s | Gas Temp: 59782.79 K | Pipe Temp: 1674.04 K | Mass: 1693.32 kg  << 1643 Kelvin steel alloy melting point see Google below
Time: 0.16s | Gas Temp: 59783.16 K | Pipe Temp: 1770.93 K | Mass: 1799.15 kg
Time: 0.17s | Gas Temp: 59783.52 K | Pipe Temp: 1867.65 K | Mass: 1904.98 kg
Time: 0.18s | Gas Temp: 59783.89 K | Pipe Temp: 1964.21 K | Mass: 2010.82 kg
Time: 0.19s | Gas Temp: 59784.25 K | Pipe Temp: 2060.62 K | Mass: 2116.65 kg
Time: 0.20s | Gas Temp: 59784.61 K | Pipe Temp: 2156.85 K | Mass: 2222.48 kg
Time: 0.21s | Gas Temp: 59784.97 K | Pipe Temp: 2252.93 K | Mass: 2328.31 kg
Time: 0.22s | Gas Temp: 59785.33 K | Pipe Temp: 2348.85 K | Mass: 2434.15 kg
Time: 0.23s | Gas Temp: 59785.69 K | Pipe Temp: 2444.60 K | Mass: 2539.98 kg
Time: 0.24s | Gas Temp: 59786.04 K | Pipe Temp: 2540.20 K | Mass: 2645.81 kg
Time: 0.25s | Gas Temp: 59786.39 K | Pipe Temp: 2635.64 K | Mass: 2751.64 kg
Time: 0.26s | Gas Temp: 59786.75 K | Pipe Temp: 2730.91 K | Mass: 2857.47 kg
Time: 0.27s | Gas Temp: 59787.10 K | Pipe Temp: 2826.03 K | Mass: 2963.31 kg
Time: 0.28s | Gas Temp: 59787.45 K | Pipe Temp: 2920.99 K | Mass: 3069.14 kg
Time: 0.29s | Gas Temp: 59787.80 K | Pipe Temp: 3015.79 K | Mass: 3174.97 kg
Time: 0.30s | Gas Temp: 59788.14 K | Pipe Temp: 3110.43 K | Mass: 3280.80 kg
Time: 0.31s | Gas Temp: 59788.49 K | Pipe Temp: 3204.92 K | Mass: 3386.64 kg
Time: 0.32s | Gas Temp: 59788.84 K | Pipe Temp: 3299.24 K | Mass: 3492.47 kg
Time: 0.33s | Gas Temp: 59789.18 K | Pipe Temp: 3393.41 K | Mass: 3598.30 kg
Time: 0.34s | Gas Temp: 59789.53 K | Pipe Temp: 3487.43 K | Mass: 3704.13 kg
Time: 0.35s | Gas Temp: 59789.87 K | Pipe Temp: 3581.28 K | Mass: 3809.97 kg
Time: 0.36s | Gas Temp: 59790.22 K | Pipe Temp: 3674.98 K | Mass: 3915.80 kg
Time: 0.37s | Gas Temp: 59790.56 K | Pipe Temp: 3768.52 K | Mass: 4021.63 kg
Time: 0.38s | Gas Temp: 59790.90 K | Pipe Temp: 3861.91 K | Mass: 4127.46 kg
Time: 0.39s | Gas Temp: 59791.24 K | Pipe Temp: 3955.14 K | Mass: 4233.30 kg
Time: 0.40s | Gas Temp: 59791.58 K | Pipe Temp: 4048.22 K | Mass: 4339.13 kg
Time: 0.41s | Gas Temp: 59791.92 K | Pipe Temp: 4141.14 K | Mass: 4444.96 kg
Time: 0.42s | Gas Temp: 59792.26 K | Pipe Temp: 4233.91 K | Mass: 4550.79 kg
Time: 0.43s | Gas Temp: 59792.60 K | Pipe Temp: 4326.52 K | Mass: 4656.63 kg
Time: 0.44s | Gas Temp: 59792.94 K | Pipe Temp: 4418.98 K | Mass: 4762.46 kg
Time: 0.45s | Gas Temp: 59793.28 K | Pipe Temp: 4511.28 K | Mass: 4868.29 kg
Time: 0.46s | Gas Temp: 59793.61 K | Pipe Temp: 4603.44 K | Mass: 4974.12 kg
Time: 0.47s | Gas Temp: 59793.95 K | Pipe Temp: 4695.43 K | Mass: 5079.96 kg
Time: 0.48s | Gas Temp: 59794.29 K | Pipe Temp: 4787.28 K | Mass: 5185.79 kg
Time: 0.49s | Gas Temp: 59794.62 K | Pipe Temp: 4878.97 K | Mass: 5291.62 kg
Time: 0.50s | Gas Temp: 59794.96 K | Pipe Temp: 4970.51 K | Mass: 5397.45 kg
Time: 0.51s | Gas Temp: 59795.29 K | Pipe Temp: 5061.90 K | Mass: 5503.28 kg
Time: 0.52s | Gas Temp: 59795.63 K | Pipe Temp: 5153.13 K | Mass: 5609.12 kg
Time: 0.53s | Gas Temp: 59795.96 K | Pipe Temp: 5244.21 K | Mass: 5714.95 kg
Time: 0.54s | Gas Temp: 59796.29 K | Pipe Temp: 5335.15 K | Mass: 5820.78 kg
Time: 0.55s | Gas Temp: 59796.63 K | Pipe Temp: 5425.93 K | Mass: 5926.61 kg
Time: 0.56s | Gas Temp: 59796.96 K | Pipe Temp: 5516.56 K | Mass: 6032.45 kg
Time: 0.57s | Gas Temp: 59797.29 K | Pipe Temp: 5607.04 K | Mass: 6138.28 kg
Time: 0.58s | Gas Temp: 59797.62 K | Pipe Temp: 5697.36 K | Mass: 6244.11 kg
Time: 0.59s | Gas Temp: 59797.95 K | Pipe Temp: 5787.54 K | Mass: 6349.94 kg
Time: 0.60s | Gas Temp: 59798.28 K | Pipe Temp: 5877.57 K | Mass: 6455.78 kg
Time: 0.61s | Gas Temp: 59798.61 K | Pipe Temp: 5967.45 K | Mass: 6561.61 kg
Time: 0.62s | Gas Temp: 59798.94 K | Pipe Temp: 6057.18 K | Mass: 6667.44 kg
Time: 0.63s | Gas Temp: 59799.27 K | Pipe Temp: 6146.76 K | Mass: 6773.27 kg
Time: 0.64s | Gas Temp: 59799.60 K | Pipe Temp: 6236.19 K | Mass: 6879.11 kg
Time: 0.65s | Gas Temp: 59799.93 K | Pipe Temp: 6325.47 K | Mass: 6984.94 kg
Time: 0.66s | Gas Temp: 59800.26 K | Pipe Temp: 6414.61 K | Mass: 7090.77 kg
Time: 0.67s | Gas Temp: 59800.58 K | Pipe Temp: 6503.59 K | Mass: 7196.60 kg
Time: 0.68s | Gas Temp: 59800.91 K | Pipe Temp: 6592.43 K | Mass: 7302.44 kg
Time: 0.69s | Gas Temp: 59801.24 K | Pipe Temp: 6681.12 K | Mass: 7408.27 kg
Time: 0.70s | Gas Temp: 59801.56 K | Pipe Temp: 6769.66 K | Mass: 7514.10 kg
Time: 0.71s | Gas Temp: 59801.89 K | Pipe Temp: 6858.06 K | Mass: 7619.93 kg
Time: 0.72s | Gas Temp: 59802.21 K | Pipe Temp: 6946.31 K | Mass: 7725.77 kg
Time: 0.73s | Gas Temp: 59802.54 K | Pipe Temp: 7034.41 K | Mass: 7831.60 kg
Time: 0.74s | Gas Temp: 59802.86 K | Pipe Temp: 7122.37 K | Mass: 7937.43 kg
Time: 0.75s | Gas Temp: 59803.19 K | Pipe Temp: 7210.17 K | Mass: 8043.26 kg
Time: 0.76s | Gas Temp: 59803.51 K | Pipe Temp: 7297.84 K | Mass: 8149.09 kg
Time: 0.77s | Gas Temp: 59803.83 K | Pipe Temp: 7385.36 K | Mass: 8254.93 kg
Time: 0.78s | Gas Temp: 59804.16 K | Pipe Temp: 7472.73 K | Mass: 8360.76 kg
Time: 0.79s | Gas Temp: 59804.48 K | Pipe Temp: 7559.96 K | Mass: 8466.59 kg
Time: 0.80s | Gas Temp: 59804.80 K | Pipe Temp: 7647.04 K | Mass: 8572.42 kg
Time: 0.81s | Gas Temp: 59805.12 K | Pipe Temp: 7733.98 K | Mass: 8678.26 kg
Time: 0.82s | Gas Temp: 59805.45 K | Pipe Temp: 7820.77 K | Mass: 8784.09 kg
Time: 0.83s | Gas Temp: 59805.77 K | Pipe Temp: 7907.42 K | Mass: 8889.92 kg
Time: 0.84s | Gas Temp: 59806.09 K | Pipe Temp: 7993.92 K | Mass: 8995.75 kg
Time: 0.85s | Gas Temp: 59806.41 K | Pipe Temp: 8080.28 K | Mass: 9101.59 kg
Time: 0.86s | Gas Temp: 59806.73 K | Pipe Temp: 8166.50 K | Mass: 9207.42 kg
Time: 0.87s | Gas Temp: 59807.05 K | Pipe Temp: 8252.58 K | Mass: 9313.25 kg
Time: 0.88s | Gas Temp: 59807.37 K | Pipe Temp: 8338.51 K | Mass: 9419.08 kg
Time: 0.89s | Gas Temp: 59807.68 K | Pipe Temp: 8424.30 K | Mass: 9524.92 kg
Time: 0.90s | Gas Temp: 59808.00 K | Pipe Temp: 8509.94 K | Mass: 9630.75 kg
Time: 0.91s | Gas Temp: 59808.32 K | Pipe Temp: 8595.45 K | Mass: 9736.58 kg
Time: 0.92s | Gas Temp: 59808.64 K | Pipe Temp: 8680.81 K | Mass: 9842.41 kg
Time: 0.93s | Gas Temp: 59808.96 K | Pipe Temp: 8766.03 K | Mass: 9948.25 kg
Time: 0.94s | Gas Temp: 59809.27 K | Pipe Temp: 8851.11 K | Mass: 10054.08 kg
Time: 0.95s | Gas Temp: 59809.59 K | Pipe Temp: 8936.04 K | Mass: 10159.91 kg
Time: 0.96s | Gas Temp: 59809.90 K | Pipe Temp: 9020.84 K | Mass: 10265.74 kg
Time: 0.97s | Gas Temp: 59810.22 K | Pipe Temp: 9105.49 K | Mass: 10371.58 kg
Time: 0.98s | Gas Temp: 59810.54 K | Pipe Temp: 9190.01 K | Mass: 10477.41 kg
Time: 0.99s | Gas Temp: 59810.85 K | Pipe Temp: 9274.38 K | Mass: 10583.24 kg

Per Google:

There is no single "best possible alloy" of steel, as "best" depends on the application, but typical steel alloys have a melting range between approximately 1370°C and 1530°C, which is about 1643 K to 1803 K. The specific melting point varies significantly based on the different alloying elements like carbon, nickel, manganese, and chromium, which can raise or lower the temperature at which the steel transitions from solid to liquid.

(th)

#24 Re: Meta New Mars » Calliban Postings including links to notable contributions » Yesterday 10:03:16

For Calliban! First, thanks for your reply in Post #308

Your mill may not be given responsibility to water the orchard, but I still think it would have merited a mention.  In fact, unless I miss my guess, it still ** does ** potentially fit into modern low tech off-grid periodicals.

This post is about your contribution to the new thermodynamics topic.  I am really flying blind here, so appreciate your feedback!

https://newmars.com/forums/viewtopic.ph … 12#p233912

The entire history of this inquiry is recorded in the archive, but I wasn't expecting anyone to actually read it.

To my surprise, offtherocks turned out to be a computer guru who can run Python the way most folks run Excell or Word.

The history of the inquiry is divided between the Python topic and the Harvest topic where results are shown.

So the answer to your question is ... no! Neither of us thought about plasma, because at the beginning of the inquiry, I just wanted to see if there is any potential value to collecting atmosphere on the way up. It turns out that a ton of air is worth millions of USD at Falcon 9 rates.

I don't think we are ultimately going to pull this off, and you may have spotted a hurdle we can't overcome.

The major engineering problem I was aware of is the need to put a cap over the tubes when the air pressure inside the tube matches the pressure of the oncoming air.  Your observation about the air turning into plasma is certainly helpful at this point, though this situation is a bit different than air flowing past a heat sheild as we have seen in Starship tests thanks to the SpaceX imagery from flight.

I think that a CFD package such as OpenFOAM could probably do a better job of modeling this scenario, but Gemini seems to think Python can handle it. I'm just along for the ride.

The reason for the new thermodynamics topic is precisely the fact that Gemini was (is) struggling with the thermodynamics of the Air Capture scenario.

So! Thanks again for you feedback!

(th)

#25 Re: Science, Technology, and Astronomy » Thermodynamics Study with Gemini >> Gas in Cold Pipe » Yesterday 08:06:07

In this post we provide the code for a Python program to study a physics problem.

We are imagining a pipe with a closed end moving toward a volume of air on Earth at STP.

We imagine the pipe is traveling at 11 km/s and that it has a temperature of 100 Kelvin.

# 20250828ThermodynamicsStudyV01
import math

# --- Constants ---
TIME_STEP_S = 0.01  # s
SIMULATION_DURATION_S = 1.0  # s
INITIAL_PIPE_TEMP_K = 100.0  # K
INITIAL_GAS_TEMP_K = 288.0  # K (Ambient temp)
PIPE_MASS_KG = 1000.0  # kg
PIPE_VOLUME_M3 = 15.0  # m^3
PROJECTILE_VELOCITY_MPS = 11000.0  # m/s
PROJECTILE_DIAMETER_M = 1.0  # m
AIR_DENSITY_KG_M3 = 1.225  # kg/m^3 (Sea level)
SPECIFIC_HEAT_AIR_J_KG_K = 1005.0  # J/(kg*K)
SPECIFIC_HEAT_PIPE_J_KG_K = 450.0  # J/(kg*K)
PIPE_ID_M = 0.04  # m
PIPE_OD_M = 0.05  # m
PIPE_DENSITY_KG_M3 = 7850.0  # kg/m^3
HEAT_TRANSFER_COEFFICIENT = 50.0 # W/(m^2*K)

# --- Calculations for Pipe Geometry ---
pipe_cross_sectional_area = math.pi * ((PIPE_OD_M / 2)**2 - (PIPE_ID_M / 2)**2)
pipe_length_for_mass = PIPE_MASS_KG / (pipe_cross_sectional_area * PIPE_DENSITY_KG_M3)
pipe_internal_volume_single = math.pi * (PIPE_ID_M / 2)**2 * pipe_length_for_mass
number_of_pipes = PIPE_VOLUME_M3 / pipe_internal_volume_single if pipe_internal_volume_single > 0 else 0
total_cooling_surface_area_sqm = number_of_pipes * math.pi * PIPE_ID_M * pipe_length_for_mass

print(f"--- Thermal Model Test ---")
print(f"Number of Pipes: {number_of_pipes:.0f}")
print(f"Total Cooling Surface Area: {total_cooling_surface_area_sqm:.2f} m^2")
print(f"Initial Pipe Temp: {INITIAL_PIPE_TEMP_K:.2f} K")
print(f"Initial Gas Temp: {INITIAL_GAS_TEMP_K:.2f} K")
print("--------------------------")

# --- Simulation Variables ---
gas_temperature_K = INITIAL_GAS_TEMP_K
pipe_temperature_K = INITIAL_PIPE_TEMP_K
collected_air_mass = 0.0
total_gas_energy = 0.0
cross_sectional_area_capture = math.pi * (PROJECTILE_DIAMETER_M / 2)**2

# --- Simulation Loop ---
for time_step in range(int(SIMULATION_DURATION_S / TIME_STEP_S)):
    
    # 1. Mass and Energy of incoming air
    mass_collected_in_step = AIR_DENSITY_KG_M3 * cross_sectional_area_capture * PROJECTILE_VELOCITY_MPS * TIME_STEP_S
    kinetic_energy_in_step = 0.5 * mass_collected_in_step * PROJECTILE_VELOCITY_MPS**2
    
    # 2. Update Gas Energy with new air
    total_gas_energy = (collected_air_mass * SPECIFIC_HEAT_AIR_J_KG_K * gas_temperature_K) + kinetic_energy_in_step
    collected_air_mass += mass_collected_in_step
    
    if collected_air_mass > 0:
        gas_temperature_K = total_gas_energy / (collected_air_mass * SPECIFIC_HEAT_AIR_J_KG_K)
    
    # 3. Calculate Heat Flow
    temp_diff = gas_temperature_K - pipe_temperature_K
    heat_transferred_this_step = HEAT_TRANSFER_COEFFICIENT * total_cooling_surface_area_sqm * temp_diff * TIME_STEP_S
    
    # 4. Update Temperatures based on Heat Flow
    if total_gas_energy > 0:
        gas_temperature_K -= heat_transferred_this_step / (collected_air_mass * SPECIFIC_HEAT_AIR_J_KG_K)
    
    pipe_temperature_K += heat_transferred_this_step / (PIPE_MASS_KG * SPECIFIC_HEAT_PIPE_J_KG_K)
    
    print(f"Time: {time_step * TIME_STEP_S:.2f}s | Gas Temp: {gas_temperature_K:.2f} K | Pipe Temp: {pipe_temperature_K:.2f} K | Mass: {collected_air_mass:.2f} kg")

If anyone runs this program this topic is available for comments.  Since I have no way of knowing ahead of time how this is going to turn out, if there is someone in the active membership who has knowledge in this area, you are welcome to pitch in.

If there is a forum reader who would like to participate, see the Recruiting topic for procedure.

(th)

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