Word: cognitum
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...Tranquillity was the target picked before the launch. Ranger VII had photographed a fairly smooth-looking place now called the Mare Cognitum (Known Sea) and found it to be pocked with small pits apparently made by chunks of rock tossed out of the crater Copernicus. A lunar landing vehicle might have serious trouble with such pits, and the hope was that the Sea of Tranquillity would prove to be smoother...
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