What do you think the world will be like in 2106?

Humans will have to colonize planets in far-flung solar systems if the race is to survive, renowned physicist Stephen Hawking said in an interview Thursday as he was awarded a top honor.

"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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Because there are no other planets like Earth in our own solar system, Hawking said humans will have to travel to another star to find