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- Path: sparky!uunet!ogicse!das-news.harvard.edu!cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!amon@elegabalus.cs.qub.ac.uk
- From: amon@elegabalus.cs.qub.ac.uk
- Newsgroups: sci.space
- Subject: Re: ET's and Radio
- Message-ID: <1992Jul30.114205.75091@cs.cmu.edu>
- Date: 30 Jul 92 11:41:50 GMT
- Article-I.D.: cs.1992Jul30.114205.75091
- Sender: news+@cs.cmu.edu
- Distribution: sci
- Organization: [via International Space University]
- Lines: 33
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- X-Added: Forwarded by Space Digest
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
-
- > If life really is somewhat rare, the place to look for ET signals
- is from
- > distant galaxies, broadcast by pan-galactic supercivilizations.
- These
- >
-
-
- Although we'd better look for the odd laser that happens to be
- pointing at us. Or maybe look for a source of modulated neutrinos. Or
- maybe start opening worm holes in the Plank-scale froth to see what
- the latest news is. The chances that advanced civilizations are
- spewing vast amounts of energy into the void in order to transfer a
- few Giga bits bits from point A to bit strains credulity to the
- breaking point.
-
- Massive radio broadcast of information with high power transmitters
- is a transient phase of civilizations. In our own case it probably
- will have a total time span of 150 years or less.
-
- Now I left out some other uses of broadcast, ie NavAids and the like
- may be useful on a planetary surface. But the power of those if going
- to be just sufficient to do the job. And in a technology thousands of
- years advanced beyond our own, that is liable to be damned little
- ERP.
-
- So I think the chances of seeing intelligent radio signals in a
- distant galaxy is related to the number of civilizations AT OUR STAGE
- that existed there n years ago, where n is also the number of light
- years distance.
-
- It also makes the current SETI search on megachannels not a search
- for intelligent life per se, but a search for intelligence that is
- within +/- 75 years of our own technology.
-