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WannabeNewton
Science Advisor
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We are in agreement then; I'm not sure anymore what this little quibble was about lol. What exactly is the issue in conclusion?Passionflower said:Certainly things can be at rest wrt to other things in curved spacetime except of course when a spacetime is non-stationary. I also see no issues with considering things at rest wrt certain coordinate values, for instance a Schwarzschild radius or a shell with a given r-value.