What are we comparing the speeds of far away objects to in order to come up with a speed? Is there a point at which we reach the single thing all motion is compared to? Is that thing light?
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You can pick any object that does not accelerate as a reference point. The speeds will be different, depending which one you pick, but the physics will work out anyway.
Picking light is actually a bad idea, as for light all distances and all time periods are zero, so all objects have indeterminate speed.
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