What is a time crystal?
In: Planetary Science
A normal crystal (space crystal) has a repeating structure in space.
A time crystal has a repeating structure in time. For example, it could repeat between structures A, B, and C in the same pattern over and over again after the same amount of time.
A spacetime crystal is also a thing. It has a repeating structure in both space and time. Structures A, B, and C would just be repeating structures in space, and the crystal changes between them like a time crystal would.
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