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Loading contentThe still-uncertain relationship between pressure and density inside a neutron star, which decides how compressible its ultra-dense matter is and therefore the star's radius and maximum mass. Pinning it down — from radius measurements by NICER, from massive pulsars, and from the tidal signature in neutron-star mergers — is a central goal of modern astrophysics.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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