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A comment on Milky Way’s Black Hole Just Flared, Growing 75 Times as Bright for a Few Hours. Parent comment

Re:Milky Way’s Black Hole Just Flared, Growing 75 Times as B... by MichaelApproved on Wednesday August 14, 2019 @09:43AM (#20695465)
> the speed you’re travelling in absolute terms

There is no such thing. You always have to compare your speed to something else. Speed is calculated relative to something else. Relativity.

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Re:Milky Way’s Black Hole Just Flared, Growing 75 Times as B... by wokwokwok on Wednesday August 14, 2019 @10:54AM (#20696157)
/shrug

My point was that if we (the solar system) were travelling as a considerable portion of the speed of light, then we would experience time dilation, which would significantly affect our observations of the external universe.

We're not.

So... it's fine.

I mean, you're basically right; speed isn't absolute, and it's wrong to refer to your speed relative to the CMBR as 'absolute'.

...but, well... I think it's fair to say 'The speed of light is constant in all frames of reference, so why [insert question here]...' is a very fair, and common question. 'Everything is relative' isn't an answer, it's just a platitude.

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