X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson
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Thu, 18 Jan 90 01:25:47 -0500 (EST)
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Date: Thu, 18 Jan 90 01:25:18 -0500 (EST)
Subject: SPACE Digest V10 #435
SPACE Digest Volume 10 : Issue 435
Today's Topics:
NASA Prediction Bulletins: Space Shuttle
Re: booster pollution
Re: SSX: Space Ship Experimental (summary)
Re: retrieving Galileo
Voyager Update - 01/16/90
Re: Big Bang: Did it happen?
NASA Funding
Re: SSX: Space Ship Experimental (stolen propaganda?)
Subject: Re: SSX: Space Ship Experimental (summary)
In article <9001121009.AA01853@zit.cigy.> bpistr@cgch.UUCP writes:
"The following was extracted from the Byte Information Exchange in the
"space/long.messages #750, from hvanderbilt, 13708 chars, Fri Jan 12 02:24:37 1990
" Space Ship Experimental
"
An area where this concept might need some serious new techonology would
be rockets designed to operate for hours instead of minutes.
Expendables run for minutes and chuck the engine. The shuttle .. well
excessive maintainance is what this SSX is supposed avoid. When have
have rocket engines been designed to operate with low maintainence for
lots-o-launches? Otherwise this sounds like a sound idea for some
goverment agency to throw big bucks at.
David Becker beckerd@cs.unc.edu
------------------------------
Date: 17 Jan 90 16:43:12 GMT
From: zaphod.mps.ohio-state.edu!samsung!cs.utexas.edu!jarvis.csri.toronto.edu!utgpu!watserv1!watdragon!watyew!jdnicoll@tut.cis.ohio-state.edu (Brian or James)
Subject: Re: retrieving Galileo
The designers of Galileo had a strong motive to use RTG designs that don't
leak large amounts of hard radiation: Galileo's electronic systems. It
wouldn't make sense to use a power source that toasted the system it was
powering, and electronics can be pretty unforgiving of doses of short
wavelength EMR and charged particles. (I had a co-op Electrical Engineering
student comment to me about the poor performance of circuit boards exposed
to 5000 Rads, although he -wouldn't- what working environment his test boards