GRAIL’s twin spacecraft are tasked for a nine-month mission to explore Earth’s nearest neighbor, where they will determine the structure of the lunar interior from crust to core and advance understanding of the thermal evolution of the moon. The GRAIL twins — GRAIL-A and GRAIL-B – will be launched together, and their circuitous route to lunar orbit will take about 3.5 months and cover about 2.6 million miles (4.2 million kilometers) for GRAIL-A, and 2.7 million miles (4.3 million kilometers) for GRAIL-B.

Source: NASA Television

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