what is the name for earth's moon
Moon The usual English proper name for Earth's natural satellite is "the Moon", which in nonscientific texts is usually not capitalized.[12][13][14][15][16] The noun moon is derived from Old English mōna, which (like all Germanic language cognates) stems from Proto-Germanic *mēnô, which comes from Proto-Indo-European *mḗh₁n̥s "moon", "month", which comes from the Proto-Indo-European root *meh₁- "to measure", the month being the ancient unit of time measured by the Moon.[17][18] Occasionally, the name "Luna" is used. In literature, especially science fiction, "Luna" is used to distinguish it from other moons, while in poetry, the name has been used to denote personification of our moon.[19]
Moon The lighter-coloured regions of the Moon are called terrae, or more commonly highlands, because they are higher than most maria. They have been radiometrically dated to having formed 4.4Â billion years ago, and may represent plagioclase cumulates of the lunar magma ocean.[61][62] In contrast to Earth, no major lunar mountains are believed to have formed as a result of tectonic events.[72]
Blue moon Owing to the rarity of a blue moon, the term "blue moon" is used colloquially to mean a rare event, as in the phrase "once in a blue moon".[4][5]
Moon landing To date, the United States is the only country to have successfully conducted manned missions to the Moon, with the last departing the lunar surface in December 1972.