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Message: <blockquote data-quote="Umbran" data-source="post: 6652215" data-attributes="member: 177">Which, by your own acceptance on the distances and time scales involved is a *pittance*, now isn't it?Remember - to see such a signal, you have to be listening on the right wavelength, and pointing your telescope at the right star, at the time the signal comes to Earth.SETI hasn't looked at all of space, and isn't looking everywhere, in all wavelengths, all the time.  They simply don't have the funding.  So, we cannot claim we've been comprehensive, by a long shot.The Arecibo telescope was used to broadcast a message back in 1974, with a power that could be detected with equipment like ours some tens or hundreds of light years away.  But it was directional, and only done for three minutes.  Pessimism and cynicism generate self-fulfilling prophecy.</blockquote>