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MYA (unit)

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{{lowercase|title=mya (unit)}} :''For other uses of '''mya''', see mya (disambiguation).'' 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 (time) present. Specifically, one mya is equal to 10⁶ years ago. The term 'mya' is now replaced in scientific literature with Ma (annum mega annum). Like the related unit bya ("billion years ago"), mya is traditionally written in lowercase. This is different from the related unit Gya, which capitalization capitalizes the first letter. The term bya is now replaced in scientific literature with Ga (giga annum).

Events around 1 mya:

Astronomy Astronomical deep time:
*The light we see now from the Andromeda Galaxy started 2.5 mya *The light we (do not) see now from the centre of the Milky Way started 0.026 mya

Geology Geologic Period (geology) periods (Neogene):
*Pliocene 5.3 to 1.8 mya **The Grand Canyon mostly formed 2-6 mya *Pleistocene from 1.81 to 0.011 mya **The last Earth's_magnetic_field#Magnetic_field_reversals magnetic pole reversal was 0.78 mya **The (Eemian interglacial) Ice Age started 0.13 mya *Holocene started 0.01 mya

Prehistory Prehistoric Paleontology:
*The Stone Age started 3 mya *''Homo erectus'' existed from 1.8 to 0.07 mya **and learns to control fire from 1.5 to 0.5 mya **and colonized Asia from 0.5 to 0.3 mya *''Homo sapiens'' appeared 0.5 mya **and emerges out of Africa from 0.1 mya on **and colonized all of Eurasia and Oceania 0.04 mya **and forms cultures since the Upper Paleolithic Revolution 0.04 mya **and colonized all of the USA America 0.01 mya

See also
* annum * Before Present * bya * tya {{paleo-stub}} {{geology-stub}} Category:Units of time de:Mya (Einheit) sh:Megaanum vi:Mya (đơn vị đo) see mya (unit)

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