Do the universe's forces merge into one?
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In general relativity, space and time are merged into one four-dimensional grid, whose properties are uniquely specified (via gravity) by the bodies inhabiting them. ... According to Einstein's general relativity equations, the spacetime containing matter cannot remain stationary and must either expand or contract.
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In general relativity, space and time are merged into one four-dimensional grid, whose properties are uniquely specified (via gravity) by the bodies inhabiting them. According to Einstein's general relativity equations, the spacetime containing matter cannot remain stationary and must either expand or contract.
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