Is It Irrational to Believe in Aliens? | Space Time | PBS Digital Studios

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Aliens! Could humans really be alone in this expansive universe? And if we're not, how come we've never made contact with other intelligent life? Everyone's thought about it; especially members of the scientific community. Join Gabe as he presents some of the most popular theories that scientists use to rationalize their support or skepticism of the existence of aliens. We may never know the answer to this age old question, but a little scientific thinking never hurt anybody!

Extra Credit:
http://en.wikipedia.org/wiki/Fermi_paradox
http://en.wikipedia.org/wiki/Drake_equation
http://www.nickbostrom.com/extraterrestrial.pdf

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Comments:
D. Moritz
https://www.youtube.com/watch?v=McsgRggUjE4&lc=z13eszqgvo33i1x2m23dtdyoowyjefau4

Gaëtan DO VAN LANH via Google+
https://www.youtube.com/watch?v=McsgRggUjE4&lc=z12pe5o5glbnvncty231fvgygubde34rz04

The Gentleman Physicist
https://www.youtube.com/watch?v=McsgRggUjE4&lc=z12su3mzuom3zds0u23hetyoyqilsfvih04

Nicholas Feeley
https://www.youtube.com/watch?v=McsgRggUjE4&lc=z121zvar2uqjdzlel22mxz4bawjev3d0n

James Morgan
https://www.youtube.com/watch?v=McsgRggUjE4&lc=z13dhrqizwajwvqeh23hf3kjmxz1wvar504

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