The wikipedia on Time Crystals offers a more clear explanation using entropy and thermal equilibrium. Simply put, a crystal is matter that is symmetric along i

The wikipedia on Time Crystals offers a more clear explanation using entropy and thermal equilibrium. Simply put, a crystal is matter that is symmetric along its lattice, which are discrete steps in space. A crystal will be like that forever if you leave it alone. A time crystal is symmetric in time, so moves between states constantly, and will do so forever if you leave it alone. https://en.m.wikipedia.org/wiki/Time_crystal https://en.m.wikipedia.org/wiki/Time_crystal