Fearless junk science detractor Phil Plait explores what it would take for a deadly alien visitation to happen on Earth, as well as answer that age old question: Are we alone? Alien Attack! airs Wednesday, October 6th at 10PM e/p, only on Discovery! For more, check out http://dsc.discovery.com/videos/#mkcpgn=ytdsc1 Phil goes spelunking deep beneath the Earth's surface to look for life forms that have adapted to extreme conditions.
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