Space-Time: Feynman's Physics Explained
Minkowski said it best: space by itself and time by itself fade into shadows, and only their union survives. We live in a four-dimensional world. An 'event' is a point in space-time, fixed by three space coordinates and one of time. Just as the distance between two points stays the same however you rotate your axes in space, there is a 'space-time interval' that every observer in uniform motion agrees on. That interval is the true geometry of our universe.
The big idea
Space and time are woven into one four-dimensional fabric.
Think about it
Two observers disagree on how far apart and how long apart two events are — yet agree on the space-time interval. Why is that reassuring?
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