this post was submitted on 22 Aug 2023
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Astronomy

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[–] [email protected] 4 points 1 year ago (3 children)

What would cause them to move so quickly?

[–] [email protected] 6 points 1 year ago

Colliding with another black hole.

[–] [email protected] 4 points 1 year ago

Multibody Black Hole Slingshot

[–] [email protected] 3 points 1 year ago

Light up shoes

[–] [email protected] 4 points 1 year ago (3 children)
[–] [email protected] 4 points 1 year ago (1 children)

Probably relative to the CMB (the frame of reference where there is no redshift or blueshift bias in any direction).

[–] [email protected] 2 points 1 year ago

Thank you! At that scale the simpler answers just don’t feel sufficient

[–] [email protected] 2 points 1 year ago (1 children)

At that speed, relative to most nearby large object

[–] [email protected] 2 points 1 year ago (1 children)

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.

[–] [email protected] 1 points 1 year ago

No other large object will be moving close to that speed so it'll be almost like they are standing still.

[–] [email protected] 2 points 1 year ago

Relative to their point of origin.

[–] [email protected] 1 points 1 year ago (1 children)

I can't even fathom something like this. There's so much energy involved. Can you imagine how bright matter around the black hole is? And there's people who believe reaching relativistic speeds will be possible soon...

[–] [email protected] 1 points 1 year ago

Black holes aren’t luminous except when matter is falling into the event horizon. So unless one of these was tearing through a nebula we probably wouldn’t see it.