Is there anybody out there?
"How likely is it that humans aren't alone in the universe? Reports of strange lights, UFO sightings and alien encounters abound-and some (like recent accounts from U.S. Navy pilots) even sound credible. And in recent years, armed with state-of-the-art technology and better information, the search for extraterrestrials overflows with exciting possibilities. Within our own solar system, astrobiologists search for the biochemical building blocks th...
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