Why do we think aliens are out there?ÂIs Earth really being visited?ÂWillÂaliens really be short, gray, and hairless?ÂWhat happens if we pick up aÂsignal from another world? These are just a few of the questions thisÂweek's guest tacklesÂregularly, in his role as the senior astronomer for the SETI (SearchÂfor Extra-Terrestrial Intelligence) Institute. Dr. Seth Shostak talks with Swoopy about the ongoing search for life in theÂuniverse, as chronicled in his new book Confessions of an Alien Hunter: AÂScientist's Search for Extraterrestrial Intelligence.