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Is it time to mention Mach's Principle yet? I'm still unsteady on that one.This is SUCH an interesting topic for experimental verification.
Short version:
I'm floating in space, holding some weights at arm's length.
I'm spinning (I can tell by looking at the stars), and I feel the weights tugging outwards as I spin.
Now, using my god-like powers, I make the rest of the universe disappear (I engineer it so that everything winks out simultaneously, despite the differences in distance -- god-like powers, and all that).
I now have no external reference to tell me I'm spinning. Do the weights still tug outwards?
Can I achieve the same effect by closing my eyes? ;-)
Michael Porter