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  1. Moon - Wikipedia

    • The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Tidal forces between Earth and the Moon have synchronized the Moon's orbital period (lunar month) with its rotation period (lunar day) at 29.5 Earth days, causing the same side of the Moon to always face Earth. The MooSee more

    DesignationEarth I
    Alternative namesLuna · Selene (poetic) · Cynthia (poetic)
    AdjectivesLunar · Selenian (poetic) · Cynthian (poetic) · Moonly (poetic)
    Symbolor
    Names and etymology

    The usual English proper name for Earth's natural satellite is simply Moon, with a capital M. The noun moon is derived from Old English mōna, which (like all its Germanic cognates) stems from Proto-Germanic *mēnōn, … See more

    Natural history

    The lunar geological periods are named after their characteristic features, from most impact craters outside the dark mare, to the mare and later craters, and finally the young, still bright and therefore readily visible crat… See more

     
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