There are two types of black hole – “stellar mass” black holes, that are about 10 times the mass of the Sun, and “super massive” black holes, which are about a million to a billion times the mass of the Sun.
And actually we still don’t really know how super massive black holes get to be so big! We can see that they have existed since the really early days of galaxies in the universe, but we’re still not sure how they evolved!
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