Different oscillations in the flux of X-rays emitted from a neutron star now seem to be linked to the frequency at which the star is spinning. That spin rate in turn hints at what the interior of such a star is made of.
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Wagoner, R. Heartbeats of a neutron star. Nature 424, 27–28 (2003). https://doi.org/10.1038/424027a
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DOI: https://doi.org/10.1038/424027a
