An artist’s depiction of the twin GRAIL spacecraft (Ebb and Flow) working together to map the moon’s gravity field. Image Credit: NASA/JPL-Caltech/MIT

An artist's depiction of the twin GRAIL spacecraft (Ebb and Flow) working together to map the moon's gravity field.  Image Credit: NASA/JPL-Caltech/MIT

An artist’s depiction of the twin GRAIL spacecraft (Ebb and Flow) working together to map the moon’s gravity field. Image Credit: NASA/JPL-Caltech/MIT

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