Astronomers solve centuries-old mystery of supernova observed in 1181

Enlarge / Hubble Space Telescope mosaic image of the Crab Nebula, a six-light-year-wide expanding remnant of a star’s supernova explosion in 1054 CE NASA/ESA/J. Hester & A. Loll (Arizona State University In August 1181, astronomers in China and Japan witnessed

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If vibration increases during cooling: anti-freezing is observed

The international team has observed a surprising phenomenon in nickel oxide materials during cooling. Instead of freezing, certain fluctuations actually increase as the temperature drops. Nickel oxide is a model system structurally similar to high-temperature superconductors. Experiments once again show

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