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I've given you a corrective upvote.

I agree you need physics Newton never dreamt of for photocells. Explaining Mercury's precession was a big deal for Relativity as well. Out of curiosity, what's non-Newtonian in a rocket launch?

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Sorry, my bad about rocket part (There is a difference in Newtonian and Relativity calculations but it is too small). For space technology it is not the rocket launches but, for instance, GPS satellites, that work with the principles of relativity, that cannot be explained by Newtonian physics.

Off topic: I have no idea how this voting stuff works, and I don't know why mine is -3

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