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The variables used in general relativity to describe the shape of spacetime. If your question is about metric units, use the tag "units", and/or "si-units" if it is about the SI system specifically.

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Schwarzschild metric was presented some where around 1916,(https://en.wikipedia.org/wiki/Schwarzschild_metric ) you can pretty much be sure that "mass"(M) was considered as "mass" at that time. It's j …
answered Apr 11 by user9976437
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I had the same question before. I think there's a paragraph in Kip Thorne's Modern Classical Physics specifically pointed out that the imaginary number could not capture the total spacial/geometrical …
answered Jul 14 by user9976437