In empty space, space-time can have many equivalent reference frames {covariance, relationalism} {covariance, relativity} {general covariance, relationalism}.
In relativity theories {relationalism}, mass-energy determines space-time curvature and shape, and space and time are not absolute or real but differ for different observers.
Perhaps, space and time are real and absolute {substantivalism, relativity}, and mass-energy alone does not determine space-time curvature and shape.
5-Physics-Relativity-General Relativity-Theory
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Date Modified: 2022.0225