cosmic year

noun

Definition of cosmic year

: the estimated time required for a star at the sun's distance from the center of the Milky Way galaxy to make one trip around it in a circular orbit, about 200 million years

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“Cosmic year.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmic%20year. Accessed 24 Sep. 2020.

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