10 cool theories about alien life are showed in this video.  There have been some NASA videos and other theories from Bill Nye posted and this one collects 10 of the most interesting from around the web.  Here is an intro about the video:

One of the biggest mysteries of the human race is whether or not we’re alone in the universe. With so many planets and galaxies that are out there beyond our stars, it is likely that we might have some alien neighbors or two. For thousands of years, people have been looking up into the sky and wonder what else is out there. From Plato to Galileo to Neil deGrasse Tyson, the stars, planets, galaxies, and other universes are doorways to alternate universes and lifeforms that are searching for other life.

Let’s find out what these theories are all about in the video on page 2

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