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Mare Tranquillitatis

[ mahr-ey trang-kwil-i-tah-tis ]
/ ˈmɑr eɪ træŋˌkwɪl ɪˈtɑ tɪs /
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noun Astronomy.
Also called Sea of Tran·quil·i·ty . a dark plain in the first quadrant of the face of the moon: about 110,000 square miles (285,000 square kilometers).
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