Frightened of rocks from outer space falling on your head today? You can be forgiven for that, as it's a going concern this afternoon. Researchers at the University of California -- Santa Barbara and California Polytechnic State University are proposing a way to put your troubled mind at ease, though. They want to launch an array of solar-powered lasers into orbit that they say could not only deflect or vaporize incoming asteroids, but also be put to uses like powering future spacecraft as they explore the solar system.
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