Astrophysicist Stephen Hawking says humans must spread out in space to surviveJune 13, 2006 in Astronomy & Space / Space Exploration
(AP) -- The survival of the human race depends on its ability to find new homes elsewhere in the universe because there's an increasing risk that a disaster will destroy the Earth, world-renowned scientist Stephen Hawking said Tuesday.
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"Astrophysicist Stephen Hawking says humans must spread out in space to survive" June 13, 2006 http://phys.org/news/2006-06-astrophysicist-stephen-hawking-humans-space.html