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A galactic year is the time it takes the solar system to do one orbit of the Milky Way Galaxy, 225-250 million years. The solar system has been in existence for 20 galactic years. At 7 galactic years the first bacteria appeared, and at 19.999 galactic years the first humans emerged

A galactic year is the time it takes the solar system to do one orbit of the Milky Way Galaxy, 225-250 million years. The solar system has been in existence for 20 galactic years. At 7 galactic years the first bacteria appeared, and at 19.999 galactic years the first humans emerged


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