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- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Newsgroups: sci.space
- Subject: Re: Titan
- Message-ID: <Bz5nBG.Czw.1@cs.cmu.edu>
- Date: 12 Dec 92 16:32:31 GMT
- Article-I.D.: cs.Bz5nBG.Czw.1
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Lines: 32
- Approved: bboard-news_gateway
- X-Added: Forwarded by Space Digest
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
-
-
- -From: gustav@arp.anu.edu.au (Zdzislaw Meglicki)
- -Subject: Re: Cassini Undergoes Intensive Design Review
- -Date: 12 Dec 92 04:28:51 GMT
- -Organization: Centre for Information Science Research, ANU, Canberra, Australia
-
- -Could anyone sum up at this stage what is known about Titan and especially
- -about the question of a possible ocean there. I vaguely recall that some
- -time ago radio-ranging of Titan returned somewhat mixed signals in this
- -matter.
-
- Recent radar mapping of Titan indicates that it does *not* have large oceans,
- though there may be smaller bodies of liquid. I don't remember where I read
- that - probably either Science News or sci.space.
-
- -|> To
- -|> further complicate the situation, the U.S. do not have any launch vehicles
- -|> that are powerful enough to send Cassini on a direct trajectory to the
- -|> outer planets.
- -Right, can't the US build such a vehicle by then? Clearly, if any serious
- -space exploration is to continue a powerful vehicle like that will be
- -needed sooner or later anyway. What happened to the idea of nuclear
- -propulsion?
-
- It's the classic "big science" problem - it doesn't make sense to risk a
- $4 billion mission on an unproven technology, when you can try it on a
- ~$100 million spacecraft going somewhere else. (Let's hope they try a small
- nuclear spacecraft sometime soon - but even if they do, the technology is
- unlikely to be ready in time for Titan, unless they delay it considerably.)
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-