Aerospace

NASA Gravity Recovery And Interior Laboratory

Two probes on a mission.
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The Sharpest Moon Map Courtesy NASA
Video: See How The Twin Satellites Work

On New Year’s Day, two probes joined each other in lunar orbit to begin creating the most detailed map of the moon yet. As NASA’s twin GRAIL satellites, named Ebb and Flow, fly in formation over mountains, craters, and underground geological formations, the moon’s gravity will fluctuate in strength, changing the distance between the two craft. By measuring these fluctuations, GRAIL will produce an ultra-high-resolution map of the moon’s gravitational field.

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