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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So, a “dimension” is (essentially) a measurable factor in determining an object’s general description in terms that are easy to understand, without having to necessarily go into the minute dots and lines of it.
That is why being able to describe an object’s width, height, and depth in 3 dimension is really useful: You are describing roughly how much space it takes on a desk, for instance.
Now, time still follows that, in determining whether the object is somewhere, was somewhere, will be somewhere, or is moving. Without time, we cannot know any of those factors, but they’re still a basic characteristic of the object itself. If you are looking at a car moving on a road, at all times, it is moving, it was somewhere, it is somewhere, and it will be somewhere, and we can use the other 3 coordinates (called respectively x, y and z) along with time to describe that car’s exact location in what is called the “spacetime”.
If time wasn’t a dimension in determining that, if you came to my house yesterday, I could say today “u/doflamingo13 is in my house”, despite you leaving after dinner, and it would be valid. Clearly, if you left, I would need to add time to describe this, and that is why it’s an important basic descriptor.
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