What would cause them to move so quickly?
this post was submitted on 22 Aug 2023
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Colliding with another black hole.
Multibody Black Hole Slingshot
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Relative to what exactly?
Probably relative to the CMB (the frame of reference where there is no redshift or blueshift bias in any direction).
Thank you! At that scale the simpler answers just don’t feel sufficient
Relative to their point of origin.
At that speed, relative to most nearby large object
But what if all nearby objects are moving towards it at a similar speed? Or away? At such a large scale speed becomes a mind bending thing.
No other large object will be moving close to that speed so it'll be almost like they are standing still.