. But scientists found that the ions’ spins would return to their original orientation at that same rate even if they were not flipped perfectly halfway. This result indicates that the system of ions prefers to respond at a certain regular period — the hallmark of a time crystal — just as atoms in a crystal prefer a perfectly spaced lattice,
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. Such time crystals are “one of the first examples of a new phase of matter,” says physicist Norman Yao of UC Berkeley, a coauthor of the new result, posted online September 27 at arXiv.org.
Time crystals take an important unifying concept in physics — the idea of symmetry breaking — and extend it to time. Physical laws typically treat all points in space equally — no one location is different from any other. In a liquid,
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In 2012,
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SCORES OF SATELLITES Janus,
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, about 181 kilometers in diameter,
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, was imaged in front of Saturn in 2006 by the Cassini spacecraft. The moon is one of at least 62 that circle the ringed planet.





JPL-Caltech/NASA,
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, Space Science Institute








Magazine issue:
Vol. 191, No. 1, January 21, 2017, p. 4








Citations




Tenth moon of Saturn,
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. Science News. Vol. 91,
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, January 14,
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, 1967,
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