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NASA GRAIL Mission
The GRAIL mission will launch in 2011 to study irregularities in the Moon's gravity field, which were likely caused by ancient impacts
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Visit SPACE.com to explore a new Tech feature each Wednesday. The Gravity Recovery and Interior Laboratory, or Grail, mission will fly twin spacecraft in tandem orbits around the moon to measure its gravity ...
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It is considered by many engineers and scientists as the "Holy Grail" of robotic red planet exploration: a Mars Return Sample mission.
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