We can imagine an object floating in the known universe, maximally distant from any other large mass. Maybe it has been there since coalescing after the big bang.
What physical phenomena tell it whether it is rotating relative to the rest of the universe and therefore experiencing a centrifugal (?) force.
Is it the combined gravity of all other matter? Is it 'spooky action at a distance'? Is it because it is rotating relative to 'empty space'?
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