Lunar Pit

a collapse pit in an otherwise smooth gray surface
NASA/Goddard/Arizona State University
October 5, 2017
CreditNASA/Goddard/Arizona State University
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This is a spectacular high-Sun view of the Moon's Mare Tranquillitatis (Sea of Tranquility) pit crater revealing boulders on an otherwise smooth floor. This image from Lunar Reconnaissance Orbiter narrow-angle camera is 400 meters (1,312 feet) wide, north is up.