In Pictures: 21 critical future NASA missions

NASA space plans include trips to Mars, Jupiter, Pluto and the Sun as well as climate change operations

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Twins: Scheduled for this year, NASA's Gravity Recovery and Interior Laboratory (GRAIL) is expected to determine the structure of the lunar interior, from crust to core and to advance understanding of the thermal evolution of the Moon. GRAIL will actually feature twin spacecraft that will fly in tandem orbits around the moon for several months to measure its gravity field in detail. As a secondary objective, GRAIL will extend knowledge gained from the Moon to the other terrestrial planets, NASA said.

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In Pictures: 21 critical future NASA missions

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