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Rough Features of a Smooth Plain

Rough Features of a Smooth Plain
Rough Features of a Smooth Plain Sinus Iridum, "The Bay of Rainbows," is one of the smoothest areas of the Moon, and parts of it appear almost featureless from a distance. But when the Lunar Reconnaissance Orbiter trains its high-resolution camera on even the flattest sections of the plain, it reveals a complex surface of craters, ejecta, and boulders. NASA / GSFC / ASU