Twin NASA spacecraft are on their final approach to begin orbiting the moon to study its surface and core in the space agency's latest moon-observation mission.
The two Gravity Recovery And Interior Laboratory (GRAIL) crafts will be placed in orbit New Year's Eve and New Year's Day, and will spend two months reshaping their orbits until they are following each other directly, according to NASA.
The agency's Jet Propulsion Laboratory is managing the mission, the goal of which is to use details on the moon's surface to map lunar gravity and use that information to understand better the moon's interior and thermal history, according to NASA.
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