Stephen Hawking Says Humans Have 1,000 Years Left on EarthThe world-renowned physicist slaps an expiration date on our planet.

Let's hope U-Haul doesn't charge too much for extra mileage in the next millennium because theoretical physicistStephen Hawkingsays humans will need to vacate Earth or face extinction in the next 1,000 years.

"Although the chance of a disaster to planet Earth in a given year may be quite low, it adds up over time, and becomes a near certainty in the next 1,000 or 10,000 years," Hawking said in alecture about the origins of the universeat Oxford University this week.

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"I don't think we will survive another 1,000 years without escaping beyond our fragile planet," he continued. "We must continue to go intospacefor the future of humanity."

(Note to Elon Musk: hurry up with thoseMars plans, dawg!)

Hawking blames the blue planet's potential demise on a multitude of man-created disasters such as nuclear war, genetically engineered viruses and global warming. (He didn't mention reality television, but that might be because his speech was running long.)

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His talk wasn't all gloom and doom, however. The great thinker implored his audience, and humankind in general, to enjoy the time we have left with words ofinspiration.

"Remember to look up at the stars and not down at your feet," he said. "Try to make sense of what you see, wonder about what makes the universe exist. Be curious. However difficult life may seem, here is always something you can do and succeed at. It matters that you don't just give up."