NASA this week will launch the GRAIL probes to map the gravity of the moon. GRAIL or Gravity Recovery And Interior Laboratory will orbit the moon on opposite sides and virtually chase each other around the satellite making measurements in the variations of the gravitational field of the moon. This will provide scientists with detailed information that will lead to future moon landings and other insights about the moon's history. The probes are scheduled to launch Thursday and should arrive at the moon around new years day.
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