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PHY=special relativity is the theory of a fixed, flat space-time, without gravity; general relativity is dynamic space-time, in which curvature gives rise to gravity.

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http://www.quantamagazine.org/how-to-think-about-relativitys-concept-of-space-time-20221114/

So special relativity is the theory of a fixed, flat space-time, without gravity; general relativity is the theory of dynamic space-time, in which curvature gives rise to gravity. Both count as “classical” theories even though they replace some of the principles of Newtonian mechanics. To physicists, classical doesn’t mean “non-relativistic”; it means “non-quantum.” All the principles of classical physics are fully intact in the relativistic context.




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