Does every galaxy have a massive black hole in the centre?

To date, only one supermassive black hole has been observed directly, deep in the core of the galaxy Messier 87. But astronomers believe that most galaxies, with the exception of very small ones, have similar black holes lurking at their centres. The evidence for this is indirect, but compelling. For example, stars and gas whiz around galaxies at such high speeds it’s clear they are in orbit around a very small, extremely massive object.

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