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<rdfs:comment>While the usage of the term is still debated, the general idea is that time crystals (which have been made using ytterbium ions and defect-bearing diamonds) break temporal symmetry analogously to how mineral crystal break spatial symmetry. While spatial crystals are inhomogeneous in space (vs a gas, which is distributed evenly) due to the ordering of their atoms, the properties of atoms in a time crystal are inhomogeneous in the time dimension.</rdfs:comment>
<obo_purl:IAO_0000115>An open system in non-equilibrium with its environment that exhibits time translation symmetry breaking.</obo_purl:IAO_0000115>
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