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Let’s take two cases: (1) your velocity is constant and (2) you are accelerating.

(1) isn’t the answer no, like that’s a core idea of Einstein’s relativity stuff?

(2) I don’t know.

Qmechanic
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CTMacUser
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1 Answers1

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Light always travels at speed c, regardless of observer/reference frame. So your speed relative to light is always the same no matter what.

Señor O
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  • So, if I had a spaceship engine rival, I couldn’t say “hey my best ship can do 80% c, while you’re stuck at 60%”? – CTMacUser Sep 16 '23 at 04:50
  • @CTMacUser 80% c relative to what, exactly? – Señor O Sep 16 '23 at 04:53
  • 80% of the speed of light. Or that can’t be done unless we use a local planet or space station (ie a frame of reference) to measure our ships’ speeds? – CTMacUser Sep 16 '23 at 04:57
  • Will the space station be "stationary"? If so, to what? This isn't even about SR, objects in space are whizzing around in all directions, and speed means nothing unless you actually drive into one of them! Then you learn the hard way what relative speed is. – m4r35n357 Sep 16 '23 at 08:30
  • @CTMacUser whoops meant to ID you in my previous comment! – m4r35n357 Sep 16 '23 at 08:54
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    @m4r35n357 of course it’s stationary, that’s why it is called a space “station” – JEB Sep 16 '23 at 15:21
  • @CTMacUser how would you propose measuring the speed of your ship, if not relative to some other object?? – Señor O Sep 16 '23 at 16:27
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    @JEB hilarious! – m4r35n357 Sep 16 '23 at 19:30