PSR J2222−0137
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PSR J2222−0137 is a nearby intermediate-mass binary pulsar at a distance of pc (approximately 870 light-years), whose low-mass neutron star's companion is a white dwarf (PSR J2222−0137 B). The white dwarf has a relatively large mass of and a temperature less than 3,000 K, meaning it is likely crystallized, leading to this Earth-sized white dwarf being described as a "diamond-star".


References

{{Reflist Pulsars Binary stars White dwarfs