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#1 Re: Human missions » Mars: A business plan - lets get at it » 2003-01-31 19:34:59

I'm sure that together we could come up with a workable mission plan, but could profit be made off of it?

#2 Re: Human missions » Semi-Direct still primary plan to send men to Mars - Is Semi-Direct plan still being used? » 2002-11-27 01:07:17

Yes and no.  Zubrin was refering to version three of the NASA Reference Mission, which you can read all about here.

It's been NASA's formal plan for manned exploration of mars for the last five years, but no one at NASA is actually working to make it happen.  This is because NASA has yet to receive any funds in the budget for it, which is not likely to happen until a) the ISS is complete, b) the space shuttle is upgraded, and c) hell freezes over*.

Not much can be done about (a) and (b), but the Mars Society is working on (c ).  But don't get too worried - if we make enough noise, and get the general population (a.k.a. voters) interested enough to make it a central issue, politicians will give in.  They are, after all, working for us.

* I'm not kidding.  Congress will kill anything related to humans-to-mars.  They're still scared of the $450 billion price tag associated with the original 90-day report.

Oh, and have a happy thanksgiving too! smile (and an early, but sill merry Christmass/Kwanzaa/Hanukkah/Solstice/Newtonmass to the rest of the world! )

#3 Re: Science, Technology, and Astronomy » New Discoveries - Extraplanetary, deep space, etc. » 2002-10-20 19:30:02

Uranus was the god of the heavens in greek mythology. IIRC, Zeus was his grandson.. but I could be way off.  Anyway, it goes along with the naming scheme for the rest of the planets (ignoring the fact that all other planets use Roman names instead).

#4 Re: Science, Technology, and Astronomy » New Discoveries - Extraplanetary, deep space, etc. » 2002-10-17 12:15:14

Nida: That's what a black hole is.  A black hole is just a clump of matter so dense that nothing known to man can escape.  There's no implication of anything on the other side.

#5 Re: Human missions » Aquarius/Moonbase Revisited - Oceanic habitats as precursors to Mars » 2002-09-18 21:45:40

Well, there are three general problems with the Aquarius "space" colony as proposed by Savage:

1) Sea cement is much, much harder to accrete than Savage would lead you to believe.  Many studies after the book was published have gone on to show that sea cement produced in real world environments is too weak to be used in structural elements, and too expensive to create.  Without this in-situ resource, the cost for construction is astronomically high.

2) OTEC power has not been technically developed to any significant extent.  OTEC, by it's nature, is a very inefficient system, and the conversion ratios shown in The Millennial Project are simply not possible today (without massive R&D).

3) Like many finantial statements made by Savage, the $8 billion income quoted in The Millennial Project was derived without taking into account the laws of economics, namely supply and demand.  Aquarius would flood an already filled market with its massive number of exports, diminishing their value greatly.  Taking economic factors into consideration, it becomes very unlikely that an Aquarian business model would even be able to break even, let alone fund an entire space program.

Hate to be the bearer of bad news, but there is a reason why the First Millennial Foundation never took off.

#6 Re: Science, Technology, and Astronomy » ten year timeline - nanotech » 2002-09-18 21:09:30

Well, when it comes to business and politics "nanotechnology" and "molecular nanotechnology" are two unrelated concepts.  "Nanotchnology," taken alone, is often used to mean the manufacturing objects on the nano-scale, and is quite different from "molecular nanotechnology," which implies atomic precision in the construction of these objects.

It is the former that receives most current funding, as it offers the quickest return on investment.  Once a technique is developed for mass productions of nano-scale, but atomically unprecise objects (using improved conventional techniques), one can expect products on the market within the year (smaller, faster, less power-hungry computer chips, and various medical tools and instruments are the most looked at possibilities).

Molecular nanotechnology, on the other hand, will require many years from first development (which is possible in a 3-year timeline) to it's predicted use in a "universal" assembler.  The ability to construct atomically precise structures may be just around the corner, but the ability to build macro-scale objects one atom at a time requires infrastructure that will take years to design and construct.

Anyway, the point is that most governments and businesses think of nanotechnology as a computer technology because that is exactly what they are funding.  Much like the development of space resources, until a profitable business plan can be written to design and develop molecular nanotechnology, or until the technology is developed by a more forward-thinking organization, molecular nanotechnology will remain in the background of business and politics.

#7 Re: Science, Technology, and Astronomy » ten year timeline - nanotech » 2002-09-17 00:26:33

Err.. convergent assembly is the name given to one process by which a nano-scale molecular assembler might operate.  It is merely one possible design for a large-scale molecular assembler, and is a resultant, not enabaling technology.  Relevant link.

The pictures and videos of developed MEMS systems are still availible on their website (some are even on the front page).  MEMS are a enabaling technology for molecular nanotechnology in that they allow (in theory) the construction of microscopic equivalents of current industrial machines, meaning much finer precision, eventually (hopefully) leading to true molecular precision.  However, despite being too small to be seen by the naked eye, MEMS are not nanotechnology, and are gigantic compared to their nano counterparts.

My point, however, was not the shortened timescale for development of molecular nanotechnology (which could be as small as a few years), but that it can and will be done by the private sector today, without the need for a full-blown government initiative, as proposed by this thread.

#8 Re: Science, Technology, and Astronomy » ten year timeline - nanotech » 2002-09-15 15:10:32

There are already funded assembler projects in the private sector, Zyvex being the first that comes to mind.  They won't tell you how close they are (for obvious reasons), but they've been working on it for some years now, and their website shows constant progress.

http://www.zyvex.com/

#9 Re: Human missions » Mars Aeroentry - How do we get out of Mars orbit? » 2002-07-26 19:07:32

Well, you'd still be screwed if your thrusters failed to fire, aerobrake or not.  Seems like the same risk to me.

#10 Re: Human missions » Alternative to the Ares Rocket - I call it "Atlas-Barbarian" » 2002-07-05 14:07:20

Does the gender of the author really matter?  Here's a good resource: http://www.astronautix.com/astros/terhkova.htm.  Some quotes of interest:

"it was Korolev's idea just after Gagarin's flight to put a woman into space as yet another novelty"

and

"Korolev was unhappy with Tereshkova's performance in orbit and she was not permitted to take manual control of the spacecraft as had been planned. Mishin later claimed she was ?on the edge of psychological instability?"

From that point onward, woman cosmonauts in the program were supposed to be considered on an equal basis with the men cosmonauts in the program, but it wasn't until 1982, one year before Sally Ride, that any of them actually saw flight duty.

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