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Re: [humanism-174] Tau Ceti's planets nearest around single, Sun-like star

From: Tim C.
Sent on: Sunday, December 23, 2012 8:37 PM
True, but the discovery of planets is still a fairly new process.  I would imagine that SETI has already allotted at least some radio telescope time to listening for evidence of civilization, but again, right now, most emphasis is on trying to develop instruments sensitive enough to detect quantities of free oxygen in exoplanetary atmospheres, which would indicate the presence of some sort of plant life!
 
Tim
 
 
In a message dated 12/23/2012 8:20:04 P.M. Eastern Standard Time, [address removed] writes:
That approach makes sense overall but it also makes sense to make a few exceptions for our closest neighbors and give them a bit of special attention...



On Sun, Dec 23, 2012 at 8:09 PM, Tim Campbell <[address removed]> wrote:
There are a number of factors here. 
First, SETI, uses radio telescope time in order to scan a decent swath of sky looking for radio signals that stand out from normal radio noise as definite signs of intelligent pattern.  They really do not try to hone in on a single star system (unless of course intelligent signals are found emanating from that star system). Theirs is a wide-path shotgun approach.
 
Now, keep in mind that humans have been around for more than a million years, animal life for more than half a billion, but radio signals from us for about a hundred. Even if there are lifeforms on a planet around Tau Centauri, the chances of their evolution having gotten to the point of sending out radio signals are pretty low.
 
Astronomers and astrobiologists look at specific star systems for evidence of life in general, not necessarily intelligent life (though finding that would certainly be nice!).
 
So basically, we have two different missions here and two different ways of looking for different evidences of life!
 
Tim Campbell
In a message dated 12/20/2012 7:03:50 A.M. Eastern Standard Time, [address removed] writes:
Surprised this one didn't start a discussion lol.
Don't have much time to research it, was curious how much time organizations such as SETI have spend pointing radar in this direction... 



On Wed, Dec 19, 2012 at 1:34 PM, sheri presloid <[address removed]> wrote:




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