The short answer is
(1) Detection of broadband signals from Earth such as AM radio, FM
radio, and television picture and sound would be extremely
difficult even at a fraction of a light-year distant from the
Sun. For example, a TV picture having 5 MHz of bandwidth and 5
MWatts of power could not be detected beyond the solar system
even with a radio telescope with 100 times the sensitivity of the
305 meter diameter Arecibo telescope.
(2) Detection of narrowband signals is more resonable out to
thousands of light-years distance from the Sun depending on the
transmitter's transmitting power and the receiving antenna size.
(3) Instruments such as the Arecibo radio telescope could detect
narrowband signals originating thousands of light-years from the
Sun.
(4) A well-designed 12 ft diameter amateur radio telescope could
detect narrowband signals from 1 to 100 light-years distance
assuming the transmitting power of the transmitter is in the
terawatt range.
Shifting the emphasis of our space program's technology to terraforming research has more potential benefits for greening Earth, and most of our information so far indicates that potential alien life is not in any rush to communicate with us. If we keep sending probes out to collect samples and gather data, our potential neighbors will notice. as much as I heart Sagan and SETI, decisions have to be made.There is no reason that we can't do both. The amount of money that we're talking about here is less than a penny per American per year. The military, in comparison, is thousands of dollars per American per year.
It seems like a waste of money to me. Even if there are extraterrestrials, does it matter whether we contact them in 1995 or 2055? I'm sure this project would be a lot cheaper in 2055.By 2055, federal funding for education will have been slashed so low, and air pollution will be so dense, that no one will know that there are other stars.
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posted by MidSouthern Mouth at 8:36 PM on April 26, 2011