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Loading contentOne of the most massive neutron stars known, at about 2.08 solar masses, weighed through the Shapiro delay of its pulses. Its radius has been measured by NASA's NICER X-ray telescope, and together the mass and radius are among the tightest constraints on the neutron-star equation of state and how dense matter behaves.
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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