[analog31]

So I wonder, where are these giant black holes now? There should be some closer to us than at the edge of the universe, unless something happens to them.

[tgarrett]

The supermassive black hole in the giant elliptical galaxy M87 is merely ~53 million light years away, close enough that we have now imaged it:

https://en.wikipedia.org/wiki/Messier_87#Supermassive_black_...

[blacksmith_tb]

Sagittarius A* is "merely" 26 thousand light years away (but we probably won't be imaging it, since there's a lot more in the way)

[erulastiel]

We’ve already imaged it with the event horizon telescope. https://en.wikipedia.org/wiki/Sagittarius_A*?wprov=sfti1#

[windsurfer]

The M87 supermassive blackhole is thousands of times as massive as Sagittarius A*, but since Sagittarius A* is a lot closer their emission rings appear roughly the same size in the sky (42 μas vs 51 μas). Both have already been imaged by the Event Horizon Telescope. https://en.wikipedia.org/wiki/Event_Horizon_Telescope