NASA’s discovery mission programme — GRAIL — The Gravity Recovery And Interior Laboratory twin spacecraft are tasked for a nine month mission to explore Earth’s nearest neighbour in unprecedented detail.
They will determine the structure of the lunar interior from crust to core and advance our understanding of the thermal evolution of the moon.
The spacecraft twins, GRAIL A and B, will fly a circuitous route to lunar orbit taking 3.5 months and covering approximately 2.6 million miles (4.2 million km) for GRAIL—A, and 2.7 million miles (4.3 million km) for GRAIL—B.
GRAIL will unlock lunar mysteries and help us understand how the moon, Earth and other rocky planets evolved as well.

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