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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Time is a “dimension” in the sense that it is a piece of information that is needed to locate something precisely. Here is an example:
Person A: “I was standing on the corner of 1st and Main street”
Person B: “Impossible! I was standing on the corner of 1st and Main street and I didn’t see you.”
Person A: “I was there on Sunday at 7pm”
Person B: “Aha! That explains it. I was there at 8pm.”
You cannot be accurate in this situation without giving location and time. Time is a dimension that is needed–just not a dimension in space. It is a time dimension. The combination of the two types of dimensions is called “the space-time continuum.” Using both space and time is an important way of being precise, especially when dealing with “relativity” in physics, where location and time get very complicated.
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