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NASA's Twin Spacecraft Orbit the Moon
NASA's twin spacecraft orbit the moon to study its gravitational field and internal structure.
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Another view of GRAIL's launch. (NASA)
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Technicians prepare to hoist one of the two GRAIL spacecraft upon completion of a thermal vacuum test at the Lockheed Martin Space Systems facility in Denver. (NASA)
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Technicians lift one of two spacecraft for NASA's GRAIL to a test stand in the Astrotech payload processing facility in Titusville, Florida. (NASA)
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GRAIL spacecraft logo emblazoned on the first stage of a United Launch Alliance Delta II launch vehicle. (NASA)