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Zooming Black Holes Can Reach ~10% The Speed of Light, Scientists Say(www.sciencealert.com)

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teft@startrek.website
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astronomy@mander.xyz
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mookulator@mander.xyz
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Relative to what exactly?

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dudinax@programming.dev
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At that speed, relative to most nearby large object

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mookulator@mander.xyz
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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.

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dudinax@programming.dev
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No other large object will be moving close to that speed so it’ll be almost like they are standing still.

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teft@startrek.websiteOP
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Relative to their point of origin.

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

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mookulator@mander.xyz
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Thank you! At that scale the simpler answers just don’t feel sufficient

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