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mare liberum
Mare Nectaris
mare nostrum
Mare Nubium
Mare Orientale
mare’s nest
mare’s-tail
Mare Serenitatis
Mare Tranquillitatis
maremma
Marengo
Mareva injunction
Marfan syndrome
marg (1)
marg (2)
marg.
margarine
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Mare Tranquillitatis

Ma·re Tran·quil·li·ta·tis [ m ray trang kwìlli ttiss ] lunar lowland plain visible in the northeast quadrant of the Moon, approximately 873 km (543 mi) across. It was the site of the the first crewed lunar landing, made by Apollo 11 in 1969.
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