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#76 2024-06-22 18:36:12

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re Musk interview...

https://newmars.com/forums/viewtopic.ph … 41#p224641

I am glad to see that GW liked the video.

Thanks for providing that link ... I was only able to afford the time to watch the first half, but hope to be able to find time to watch the second half.  I really like the way the interviewer and Elon interacted.  The interviewer did a pretty good job of speaking on behalf of the audience, and Elon did an amazing job of keeping his cool, and dealing with the questions as they came up.

In watching the video, it is fun to know that most of the test objectives were met.

(th)

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#77 2024-07-09 05:12:23

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re bubble worlds ....

If a traveler were to visit one of these, what would they see/experience?

1) What would the world look like from the outside?
2) How would access to the interior take place?
3) What would the interior look like?
4) Should the visitor remain inside the space craft during the visit?

(th)

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#78 2024-07-09 08:42:05

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re topic on Bubble Worlds....

tahanson43206 wrote:

For Void re bubble worlds ....

If a traveler were to visit one of these, what would they see/experience?

1) What would the world look like from the outside?

So the answer is that on the sunward side, we would see a reflection of the Sun, except where there are windows, and on the anti-sunward side we would see nothing because the surface would reflect no light, and it would not produce light. I assume that surface would be bright in infrared?

2) How would access to the interior take place?

I have no idea at this point.

3) What would the interior look like?

Rotating habitats would seem reasonable, since you have included them in your vision.

4) Should the visitor remain inside the space craft during the visit?

I get the impression this would be a ** good ** idea?

(th)

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#79 2024-07-10 20:36:51

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re (to me surprising) post about making a bubble world at Mars...

Please add a bit of detail to this latest branch from a sturdy tree...

If you were a real estate developer, and you had a vision for the Mars system, you would hire skilled artists to make inspiring images to show the vistas your customers will enjoy and appreciate.  A few will decide to invest small amounts to encourage you to create more detailed specifications for the development.

As luck would have it, you ** are ** a skilled artist in using the tools you have shown us.

(th)

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#80 2024-07-13 20:48:02

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re coupled beam link ...

You are certainly right that the forum is operating in steady-as-she-goes mode, with members fully engaged in their own activities. The community room is quiet at the moment, but I am confident it will fill back up at some point.

In the meantime, posts such as your most recent one get undivided attention from those who do stop by.

I haven't read the link yet, but am responding to the the ** very ** nice artwork you provided.

The spreading of photon beams and particle beams has been a known problem for as long as I can recall presentations on the subject, so your post is most encouraging.  I will follow the link shortly, in hopes that someone has found a way to keep a beam tightly focused over light years if necessary.

Update after first scan of the article ... This article is certainly encouraging, but it appears to describe theoretical studies at this point.

I am certainly glad to see that ** someone ** is investigating this concept.  It will be a bit of a stretch from here to Proxima Centuri, but great ideas start out small, and this one appears to have garnered some support.

(th)

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#81 2024-07-18 04:41:59

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re new applicant ...

If you have time, and the request is of interest, please take a look at the candidate application we received this morning, as reported in the Recruiting topic.

This person appears to have vision in your class.  However, we don't know anything about the candidate at this point, and I would appreciate any assistance our members might provide.

Is this person someone we would like to include in the group? The active membership is very small at this point.  Is this someone who is interested in publishing his own work without regard to the postings of others?  That is a possibility. We have seen that before in the 20+ year history of the forum.

It this person interested in existing active members? 

(th)

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#82 2024-07-19 03:39:37

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void...

Thanks for your evaluation of the prospective new member.

Regarding your recent post on a possible habitat design for Mars, I have a question about the interesting suggestion of using tar for protection.

http://newmars.com/forums/viewtopic.php … 13#p225213

I'd be interested in learning more about how tar might be a superior radiation protection material.

Tar consists of Carbon and Hydrogen as the base. I asked Google for a list of the other substances found in tar, and a partial list includes oxygen, nitrogen and sulfur.  A quick scan of Google's offerings seems to show that lead is favored for radiation protection in certain wavelengths, but materials with hydrogen are favored for other radiation such as cosmic rays.  I understand that cosmic rays are nuclei with no electrons, such as alpha particles.

I asked Google again, and if found an article from space.com stating that cosmic rays are 90% hydrogen nuclei, and 9% alpha particles.  The remaining 1% may be nuclei of heavier elements, but those can pack a wallop .

If you can find a reference that compares materials in their effectiveness for blocking various wavelengths of radiation, it would be a helpful addition to the discussion of radiation protection.

(th)

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#83 2024-07-19 08:03:11

tahanson43206
Moderator
Registered: 2018-04-27
Posts: 18,189

Re: Void Postings

For Void re latest post in Radiation topic ...

Thank you for the helpful comparison of a combination of tar and sand with concrete.

It is ** good ** to know that the combination is nearly twice as effective at blocking neutrons as concrete, at what I expect would be a much lower price.

However, it remains true that this forum has not yet accumulated knowledge the entire field of radiation protection.

The members of the forum have collected a large number of deep dives into particular kinds of radiation and protection methods, but as far as I know (always subject to correction) we do not yet have a single, comprehensive collection covering all radiation from beta particles to the most powerful cosmic ray nuclei.

The raditaion topic would be a good place for such a repository to build up over time.

(th)

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