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GRAIL (Gravity Recovery and Interior Laboratory)

Artist's concept of GRAIL's twin spacecraft in orbit around the Moon
Artist's concept of GRAIL's twin spacecraft in orbiting the Moon
A mission consisting of twin spacecraft which will fly in tandem orbits around the Moon for several months to measure its gravitational field in unprecedented detail. The mission will also answer longstanding questions about the Moon and provide scientists with a better understanding of how the Earth and other rocky planets in the Solar System formed.

GRAIL is part of NASA's Discovery Program. It is scheduled for launch on Sep. 8, 2011, by a Delta II rocket from Cape Canaveral Air Force Station.

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