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From Wikipedia, the free encyclopedia
PSR J2222−0137 is a nearby intermediate-mass binary pulsar at a distance of 267+1.2
−0.9 pc (approximately 870 light-years),[1] whose low-mass neutron star's companion is a white dwarf (PSR J2222−0137 B). The white dwarf has a relatively large mass of 1.319 ± 0.004 M☉[2] and a temperature less than 3,000 K,[1] meaning it is likely crystallized, leading to this Earth-sized white dwarf being described as a "diamond-star".[3]
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