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- From: dcarroll@oucsace.cs.ohiou.edu (Dana Carroll)
- Newsgroups: rec.puzzles
- Subject: Re: Billion-year survivability
- Message-ID: <1992Nov17.163245.14885@oucsace.cs.ohiou.edu>
- Date: 17 Nov 92 16:32:45 GMT
- References: <10920011@pollux.svale.hp.com> <1992Nov10.114703.26890@ugle.unit.no> <1992Nov12.195311.22523@wisipc.weizmann.ac.il>
- Organization: Ohio University CS Dept,. Athens
- Lines: 30
-
- >>|> If I wanted to send information to a society that will inhabit the earth
- >>|> one billion years in the future, how would I do it? If I engraved the
- >>|> message on a bunch of diamonds, then buried the diamonds in a secure place,
- >>|> would that do it? There must be a better way.
-
- In Carl Sagan's book, "Contact", there is a method whereby three superimposed
- messages can be sent in one radio signal: At the top layer, something to
- indicate that this is a bonafide message, not a random signal; in the
- second layer, the actual message itself; in the third layer, a key to
- decryption. The book is very well written and easy to follow; it details
- the problems that the scientists had not only recognizing that this was in
- fact a message but how to decrypt it as well.
-
- So the answer is simple: simulatenously send out the radio signal in all
- directions, powerful enough so that it will still be around in a billion
- years, and hope that it will eventually be reflected back to earth.
-
- Another poster suggested beaming at an object that is 500,000,000 light years
- away, so that the signal will return in 1 billion years. But this may not
- work, as that object may not be there when the signal reaches it. By sending
- in all directions at once, we would be beaming at that object, but will also
- be beaming at ALL objects that far away, so that maybe one of them will still
- be around that far in the future.
-
- Of course, the signal encryption that Sagan describes may be a poetic license
- and not possible at all, but I think that all of his technology in the book
- (except for the computers) is possible with today's technology.
-
- Other than this, I cannot see a possible solution, as there is no way to
- guarantee the existence of any object that far in the future.
-