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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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Using a precision formation-flying technique, the twin GRAIL spacecraft will map the moon's gravity field, as depicted in this artist's rendering. (NASA)
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A NASA handout image shows an artist's concept of the GRAIL mission's twin spacecraft in orbit around the moon. (Reuters/NASA)
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Artist's concept of GRAIL-B performing its lunar orbit insertion burn. (NASA)
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The September 10 launch of the United Launch Alliance Delta II Heavy rocket carrying NASA's twin Gravity Recovery and Interior Laboratory (GRAIL) spacecraft. (NASA)