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I wonder how big is (was?) that black hole? Is it the size of our sun?

M87's black hole event horizon is larger than our entire solar system. 2B+ solar masses.

I like this visualization of the staggering orders of magnitude: https://www.youtube.com/watch?v=QgNDao7m41M

M87: 47 au

Solar system: 30

UHZ1: 1