A computer illustration of a large asteroid colliding with Earth. (Size may not be to scale.) Such an impact is believed to have led to the death of the dinosaurs some 66 million years ago. Mark Garlick /Getty Images/Science Photo Library RM hide caption

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Mark Garlick /Getty Images/Science Photo Library RM

Radio telescopes of the Allen Telescope Array are seen in Hat Creek, Calif. A signal that intrigued scientists has been found to have its roots on Earth, Russian scientists say. Ben Margot/AP hide caption

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Ben Margot/AP

This artist's concept depicts some of the planetary discoveries made by NASA's Kepler Space Telescope. Tuesday's announcement more than doubles the number of verified planets discovered by the Kepler mission. W. Stenzel/NASA hide caption

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W. Stenzel/NASA

NASA Spots 1,284 New Planets, Including 9 That Are 'Potentially Habitable'

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This artist rendering shows Kepler-11, a sun-like star around which six planets orbit. A planet-hunting telescope is finding whole new worlds of possibilities in the search for alien life, including more than 50 potential planets that initially appear to be in habitable zones. The agency's chief scientist said Tuesday there will be "strong indications" of alien life within a decade. NASA/AP hide caption

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NASA/AP

SETI says that its Allen Telescope Array will be back online in September, thanks to funding secured from online donations. The array is seen here, adjacent to a cow pasture in Hat Creek, Calif. Ben Margot/AP hide caption

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Ben Margot/AP