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Originally Posted by Brady Yoon
How come our black hole is so small (in relative terms). I heard the Sagittarius A in the center of our galaxy is only a few million solar masses. How do black holes get to be the size of billions of solar masses? Isn't the Milky Way a pretty big galaxy?
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Isn't the size of the black hole related to the size of the bulge of galaxy? Milky Way doesn't have really big bulge, whereas giant ellipticals are virtually nothing but huge galactic bulges. As far as I know, those black holes weighting billions of suns are found only in such giant ellipticals, for example in M87.