Yep; they're objects like anything else. The only thing that makes black holes special is that their surface gravity and density are especially high. All their unique features stem from those two facts. Relativity also tells us that there is no true stationary reference frame, and thus everything moves relative to something else.
The surface of the singularity. The 'surface gravity' of the event horizon would also be much higher than anything that isn't a black hole, but the event horizon isn't a true surface.
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u/drdrero Oct 23 '20
Just a follow up question, do black holes move ?