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Somewhere between 3.84 and 3.87 billion years ago, a large
asteroid or comet struck the Moon and formed the huge impact
basin called Mare Imbrium (the “Sea of Rains”) and uplifted
a tall mountain range, the Apennine Mountains, with peaks
rising more than 5 kilometers above the floor of the basin.
A spot within this range, and next to a large lava channel,
was chosen as the landing site for Apollo 15.
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