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NASA scientist weighs space rock from millions of miles away
A NASA scientist has accurately determined the mass of a nearby asteroid from millions of miles away. Steve Chesley at NASA's Jet Propulsion Laboratory in Pasadena, Calif., made the achievement by utilizing data from three NASA assets-the Goldstone Solar System Radar in the California desert, the orbiting Spitzer space telescope, and the NASA-sponsored Arecibo Observatory in Puerto Rico. For Chesley
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