Word: aristillus
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...Lunik II's instruments was a moon altimeter designed to measure its faster and faster approach to the lunar surface. Lunik II, the Russians say, landed on the edge of the Sea of Serenity, near the craters Aristillus, Archimedes and Autolycus. They think the last-stage rocket hit the moon too, but they do not know where. Since it was much heavier (3,325 Ibs.) than the instrumented payload (860 Ibs.), it must have splashed a considerably bigger crater...
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