The Moon is a small natural satellite that orbits the Earth.  It formed 4.5bya and was subject to being hit by meteorites during the Cryptic, Basin Groups, Nectarian, and Lower Imbrian eras.  During the Lower Imbrian era, the basins Crisium, Tranquilitatis, Serenitatis, Fecunditatis, and Procellarum were formed.

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