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What if the speed of light were slower?

Daniel and Kelly’s Extraordinary Universe

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The Definition of Velocity for Distant Objects Is Funky in Geneal Relativity

It's because velocity of far away objects is not really well defined. If you are near a photon, it will always be moving at the speed of light relative to you. But that's because also your time fim is also being slowed downright? Exactly. And so locally, space is always flat and near you. And so if you're with the photon, it's moving through flat space at the speed Of light. A distant observer, that's where the problem comes in, because the definition of velocity for distant objects is funky in geneal relativity.

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