Such large timespans are better measured in galactic years [1] and Earth axial precession periods [2] which is 26,000 years or 1/10,000 of a galactic year. Wit

Such large timespans are better measured in galactic years [1] and Earth axial precession periods [2] which is 26,000 years or 1/10,000 of a galactic year. With these measures, the Milky Way was "born" about 49 galactic years ago and will "die" in 49 galactic years, so we are almost precisely in the middle. It's an interesting coincidence, that on this scale, eukaryotes appeared 6.666 galactic years ago (from [1]). [1] https://en.m.wikipedia.org/wiki/Galactic_year https://en.m.wikipedia.org/wiki/Galactic_year [2] https://en.m.wikipedia.org/wiki/Axial_precession https://en.m.wikipedia.org/wiki/Axial_precession