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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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Which of these two is Einstein's greater contribution? [closed]

They are one thing called spacetime. Presumably, Einstein brought these ideas to the world first. Which has the greater impact and why? Or in other words, which idea shocks physicists the most? …