A time machine can not exist unless it is a space-time machine because without moving in space, moving forward or backward in time will put the traveler out of sync with where the Earth is and where its rotation is making it impossible to visit the time of which the traveler is trying to visit. Time and space are forever intertwined, because no observer has ever been at a specific place, unless it was at a specific time, and an observer does not notice a specific time, unless it is at a specific...
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