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Irregular Mare Patch : ウィキペディア英語版 | Irregular mare patch
An irregular mare patch also known as an IMP, is a smooth, rounded, slightly mounded area, generally about 500 meters wide, occurring in the Lunar maria.〔Wood, Charles. "Strange Little IMPs." ''Sky and Telescope,'' February 2015 issue.〕 ==Discovery== Due to their small size, and corresponding difficulty of observational astronomy from Earth, the first irregular mare patch discovered, Ina, was only found in 1971 after analysis of photographs taken by Apollo 15. More were discovered by the Lunar Reconnaissance Orbiter, which was launched in 2009 and found about 70 more.
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