Summary
"The long-term survival of the human race is at risk as long as it is confined to a single planet," he said in a radio interview with the British Broadcasting Corp. "Sooner or later, disasters such as an asteroid collision or nuclear war could wipe us all out. But once we spread out into space and establish independent colonies, our future should be safe."
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Science in Brief
Colonize space: Hawking
LONDON -- Humans will have to colonize planets i...See the full content of this document
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