Can we travel in past in 4rth dimension because according to physics it is not possible to travel in past in even 4rth dimension we can only go in future.pls explain.
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It seems you are using some Hollywood physics here. There is not a 4th spatial dimension in physics. Spacetime is four-dimensional, but it there is no defined "4th dimension" in which you can travel, as if it were some kind of secret passage. As is, physics do NOT permit travel to past in any way. However due to relativity, it is possible to "travel to the future".
When you are traveling at very high velocities, time moves slower for you than for those who are not. Thus, if you were to travel away from Earth at a speed that is close to the speed of light for some time, and then return from Earth, you would find that more time has passed here than in your frame of reference, thus you would have "traveled in time".
I recommend you to study some Special relativity if this topic interests you, but remember that that 4th dimension time traveling thing is mainly Hollywood physics, not real physics
Nick Heumann
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