![]() ![]() Both general and special relativity shows time to be relative, and general relativity is open to the possibility of temporal shenanigans. ![]() Einstein wondered whether time travel-more specifically ramifications of Gödel’s universe-could be “ excluded on physical grounds.” In a 1992 paper, Stephen Hawking coined the “ chronology-protection conjecture.” That’s basically a temporal accord baked into the laws of the universe to render time travel impossible and, in Hawking’s words, “make the universe safe for historians.” And Russian physicists Igor Dmitriyevich Novikov formulated a similar idea with his “self-consistency conjecture.”īut physics can’t preclude the possibility of time travel entirely. Many physicists have agreed with that assessment. ![]()
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