Can you explain to me how time is regarded as the 4th dimension? Does it mean that if we assume time as a dimension then an object traveling to different time period is possible?
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As you walk down the street from your house to the store, the place and time you’re at are both changing. You’re traversing the four dimensions of space-time.
And the relative rate, at which time passes for you, is affected by your positional velocity, and by the gravitational field you’re in.
But no—just because time is a dimension you move through, even at variable speed, doesn’t imply that you have freedom of movement through it.
Think of moving through time like free-falling, at a steady rate, where wind resistance balances the acceleration of gravity. Changing your wind resistance can change how fast you fall, but it can’t reverse the fall—never mind teleport you to some non-contiguous time.
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