A galactic year, the time it takes for our solar system to make one revolution around the center of the Milky Way Galaxy, is estimated to be around 225 to 250-million Earth-years. Relatively, taking the estimate of when our sun was created as year zero, oceans began to develop on earth after four galactic years and modern humans appeared after roughly 19.999 galactic years. Present day is considered to be about 20 galactic years.
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