The Physics of Time
In Our Time
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The Importance of Time as the Fourth Dimension
Two observers, two different people, say one on earth and one moving by in a rocket, won't agree on how long an object is or how far two points are in space. One will say, two flashes of light, for instance, one on Earth,. the observer on Earth will say those two flashes of lights happened at the same time - they're a mile apart. And then the other one on the rocket may say no. In fact, those two events are a millisecond apart. That's why it's important to have time as the fourth dimension. It's only when you can combine time and space together in these four dimensions that you can invent a new distance that's a
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