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Within relativity (both special and general), changes of reference frames can change both the notions of space and of time, with one depending on the other as well. As a consequence, it is necessary to treat both concepts in a unified manner. Hence the term spacetime.
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Spacetime and uncertainty principle
Einstein however, explained that space and time are tied together and the real fabric of the universe is spacetime through which all objects navigate. … It feels as if space uncertainty should therefore be spacetime uncertainty. Is this wrong? …