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After the traumatic explosion of the 2003 space shuttle Columbia, scientists were surprised to discover micro-organisms that have survived. How does this information impact their knowledge of their universe, and the existence of life? Find out more from this great video from BBC Horizon show 'We Are the Aliens'.

Stephen Hawking - How Did Life Begin?

Stephen Hawking explains how life may have began on Earth, and turns to evolution to determine what extraterrestrial life may look like.

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