Aliens: The Big Think | BBC ‪‎Documentary‬ - Professor Martin Rees, the astronomer royal, searches for extra-terrestrials in a film that gets inside the minds of the scientists considering whether we're alone in the universe.

http://cosmosdocumentaries3.blogspot.com/2016/04/aliens-big-think-bbc-documentaries.html

Submitted April 24, 2016 at 12:31PM by ondoc http://www.reddit.com/r/aliens/comments/4g8t79/aliens_the_big_think_bbc_documentary_professor/