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For other uses, see Myr (disambiguation).

The abbreviation myr, "million years", is a unit of a quantity of 1,000,000 (i.e. 1×106) years. An example of this usage is the estimated age of the universe, which is around 13,798 myrs.


Commonly used in astronomy, it is sometimes written as "mya", a million years ago. It used to be used in geology, but Ma (Megaannum) is more common today.

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