Evidence for a bizarre state of matter was found in the dense core of the star left behind, a so-called neutron star, based on cooling observed in over a decade of Chandra X-Ray Telescope observations. NASA's Chandra X-ray Observatory discovered direct evidence for a superfluid, a strange, friction-free state of matter, at the core of Cassiopeia A.
Superfluids created in laboratories on Earth exhibit remarkable properties, such as the ability to climb upward and escape airtight containers. The discovery has important implications for understanding nuclear interactions in matter at the highest known densities.
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