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Nasa's Grail Mission Solves Mystery of Moon's Surface Gravity


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GRAIL spacecraft moon map

Using a precision formation-flying technique, the twin GRAIL spacecraft mapped the moon's gravity field, as depicted in this artist's rendering.

Credit: NASA/JPL-Caltech

NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission has uncovered the origin of massive invisible regions that make the moon's gravity uneven, a phenomenon that affects the operations of lunar-orbiting spacecraft.

From Jet Propulsion Laboratory/NASA
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