Astronomers confirm the existence of a lone black hole

Reads over actual paper

I'm going to take your word for it.

Given how difficult that seems to be to find that kind of visual disturbance in a place like the galactic center where things are moving relatively fast, no way is a lone black hole going to be seen anywhere outside that kind of bee swarm of stars. But there certainly must be a lot of them, no reason to think there aren't.

Note that you can't see the black hole in this image (an optical HST image). The black hole was identified through microlensing of the object labeled "source", followed by subsequent astrometric observations. The black hole is the lens, which is not seen in these images because it's too faint.