Are we alone in the universe? Some of the world's greatest minds have taken this question on. Watch the video below to hear the theories of experts from Nicola Tesla to Neil deGrasse Tyson.
Top 10 Theories On Alien Life
Find out what the experts think about whether or not there is life on other planet.
How Are We Looking For Aliens?
We may not have found them yet, but that's not for lack of trying.
The Fermi Paradox, Explained
It's very likely that there's other life in the universe, so why haven't we found it?
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