The Rare Earth Hypothesis: What Makes Our Planet Special? | BBC Earth Science

From the Rare Earth hypothesis to what our first alien encounter could be like, watch as scientists consider if we are alone in the universe.

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Taken from 'Aliens: The Big Think' (2016)
The hunt for aliens is on! After a distinguished career in cosmology Professor Martin Rees, the astronomer royal, has taken up the search for extra-terrestrials. Looking for aliens is no longer science fiction - it is a question that's engaging some of the greatest minds in science. As our knowledge of the universe has increased, we're getting closer to answers. Many scientists now think we live in galaxy with a billion Earth-like planets, many of which may be teeming with life. But what kind of life?

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