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An event is something that happens at a particular point in space and at a particular time. So one can specify it by four numbers or coordinates. Again, the choice of coordinates is arbitrary; one can use any three well-defined spatial coordinates and any measure of time. In relativity, there is no real distinction between the space and time coordinates, just as there is no real difference between any two space coordinates.
— A Brief History of Time
 (book)
by Stephen Hawking
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| Language: | English |
| Submitted by: | spondulix |
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