GRAIL Flying in Formation
Using a precision formation-flying technique, the twin GRAIL spacecraft will map the moon's gravity field.
The mission also will answer longstanding questions about Earth's moon, including the size of a possible inner core, and it should provide scientists with a better understanding of how Earth and other rocky planets in the solar system formed. GRAIL is a part of NASA's Discovery Program.
Credit: NASA/JPL-Caltech
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