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Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g 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 ----------------------------------------­------------------------------- 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 ----------------------------------------­------------------------------- New SpaceTime episodes every Wednesday! Want to ask some sort of crazy question about Space?: Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Hosted by Gabe Perez-Giz Made by Kornhaber Brown (www.kornhaberbrown.com)