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Comment Re:The ocean frontier - not (Score 1) 138

I saw a presentation on NASA's current thoughts on shielding, but didn't take notes so I can't quote specifics. The shielding choices they listed were water, polyethylene, and liquid hydrogen. The LH2 was the most effective and thinnest shield. A water shield for an Earth-Mars trip was something like 1-3 meters thick and not thought to be practical for launch from Earth. Someone did suggest captured "comet cores" as the best source of a water shield.

Comment Re:Air drop that puppy (Score 3, Informative) 228

The HDU work to-date has focused on developing processes, procedures, and some technologies you'd need to live away from Earth. The first assumption is, "We have a habitat." They're still figuring out where to put lights and bunks before building expensive hardware for tests in near-Earth space. With current Administration/NASA plans, the next step is a Lagrange point and/or asteroid. Mars (and those siting and assembly issues) will have to wait...

Comment Re:In a nutshell: (Score 1) 725

Checking #6 at the second link, they're clearly using Fortran. After seeing "Xtr" used to condense "Extra", I was surprised to see "idays" and "nweeks" instead of old-timer "idys" and "iwks" in the subroutine. As a Fortran snob, I hope the poor use of indentation and lack of whitespace is simply a result of the conversion to HTML.

Comment Re:Self Correcting Problem (Score 1) 185

Also important are that there are fewer small debris at GEO and the debris-encounter velocities are much lower. There's some interesting stuff in the beginning of NASA's "History of On-Orbit Satellite Fragmentations" (like figures 1.3.2-2 & -2). This and other docs are linked here.

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