Neutron Star Provides Direct Evidence for Bizarre Type of Nuclear Matter - ScienceNOW: Scientists have accumulated indirect evidence for such pairing and superfluidity. For example, spinning neutron stars called pulsars emit clocklike streams of electromagnetic pulses. Usually incredibly steady, that pulsing sometimes speeds up abruptly. Such "pulsar glitches" likely result from brief interactions between the neutron star's solid crust and superfluid interior...
...Chandra data showed Cas A was cooling so fast that they could measure the change. So instead of looking at many neutron stars, researchers needed to look at only this one. "This is definitely the first time that we've been able to see an appreciable temperature change in a neutron star..."
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