Pamela: There are also things called "supermassive black holes"that are somewhere between hundreds of thousands and tens of billions times bigger than our Sun.
Fraser: What percentage of the mass of a galaxy is that? There must be a big chunk of a galaxy just in that black hole.
Pamela: It's a huge amount. These things form the core of galaxies, and the mass of a supermassive black hole in the centre of a galaxy is actually related to the size of the halo of a galaxy and how fast the stars within the galaxy are moving. These are basically the angry monster sitting at the core of every galaxy just waiting to feed on in-falling material.
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