posted on Oct, 28 2012 @ 08:40 AM
Radio waves are a form of light, so the "loudness" of the signal decreases in proportion to the distance. Commercial radio signals would be
"inaudible" even from the nearest stars. A civilization that has advanced enough to detect habitable planets in the region, and we are now such a
civilization, could initiate a program to contact its neighbors by focusing a very large radio telescope on a particular solar system and sending an
extremely powerful signal in the hopes that the intended recipients are equally advanced. SETI is not, therefore, a complete waste of time, but the
odds that two civilizations are at the same level of technological development within fifty light years of each other are extremely long.