Mya (unit)

:For other uses of mya, see mya (disambiguation).

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In astronomy, geology, and paleontology, mya is an acronym for million years ago and is used as a unit of time to denote length of time before the present. Specifically, one mya is equal to 106 years ago. The term 'mya' is now replaced in scientific literature with Ma (mega annum).

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It should be noted that like the related unit bya ("billion years ago"), mya is traditionally written in lowercase. This is different from the related unit Gya, which capitalizes the first letter. The term bya is now replaced in scientific literature with Ga (giga annum).

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Astronomy: :This article is about the science branch. For information about the magazine, see Astronomy (magazine)....

Geology: Geology (from Greek γη- (ge-, "the earth") and λογος (logos, "word", "reason")) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. It is one of the Earth sciences....

Paleontology: Paleontology (the American spelling; the British spelling is palaeontology) is the study of the developing history of life on earth, of ancient plants and animals based on the fossil record, evidence of their existence preserved in rocks. This includes the study of body fossils, tracks, burrows, cas...

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