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  2. Neutron star - Wikipedia

    en.wikipedia.org/wiki/Neutron_star

    In neutron stars, the neutron drip is the transition point where nuclei become so neutron-rich that they can no longer hold additional neutrons, leading to a sea of free neutrons being formed. The sea of neutrons formed after neutron drip provides additional pressure support, which helps maintain the star's structural integrity and prevents ...

  3. PSR J0737−3039 - Wikipedia

    en.wikipedia.org/wiki/PSR_J0737%E2%88%923039

    A neutron star is the ultra-compact remnant of a massive star which exploded as a supernova. Neutron stars have a mass bigger than the Sun , yet are only a few kilometers across. These extremely dense objects rotate on their axes , producing focused electromagnetic waves which sweep around the sky and briefly point toward Earth in a lighthouse ...

  4. PSR J0952–0607 - Wikipedia

    en.wikipedia.org/wiki/PSR_J0952–0607

    PSR J0952–0607 is a massive millisecond pulsar in a binary system, located between 3,200–5,700 light-years (970–1,740 pc) from Earth in the constellation Sextans. [6] It holds the record for being the most massive neutron star known as of 2022, with a mass 2.35 ± 0.17 times that of the Sun—potentially close to the Tolman–Oppenheimer–Volkoff mass upper limit for neutron stars.

  5. List of neutron stars - Wikipedia

    en.wikipedia.org/wiki/List_of_Neutron_stars

    Zooming to RX J1856.5−3754 which is one of the Magnificent Seven and, at a distance of about 400 light-years, the closest-known neutron star. Neutron stars are the collapsed cores of supergiant stars. [1] They are created as a result of supernovas and gravitational collapse, [2] and are the second-smallest and densest class of stellar objects ...

  6. Hulse–Taylor pulsar - Wikipedia

    en.wikipedia.org/wiki/Hulse–Taylor_pulsar

    The pulsar and its neutron star companion both follow elliptical orbits around their common center of mass. The period of the orbital motion is 7.75 hours, and the two neutron stars are believed to be nearly equal in mass, about 1.4 solar masses. Radio emissions have been detected from only one of the two neutron stars.

  7. Compact object - Wikipedia

    en.wikipedia.org/wiki/Compact_object

    A star in this hypothetical state is called a "quark star" or more specifically a "strange star". The pulsar 3C58 has been suggested as a possible quark star. Most neutron stars are thought to hold a core of quark matter but this has proven difficult to determine observationally. [citation needed]

  8. X-ray binary - Wikipedia

    en.wikipedia.org/wiki/X-ray_binary

    A high-mass X-ray binary (HMXB) is a binary star system that is strong in X rays, and in which the normal stellar component is a massive star: usually an O or B star, a blue supergiant, or in some cases, a red supergiant or a Wolf–Rayet star. The compact, X-ray emitting, component is a neutron star or black hole. [1]

  9. Gravitational collapse - Wikipedia

    en.wikipedia.org/wiki/Gravitational_collapse

    Neutron stars are expected to have a skin or "atmosphere" of normal matter on the order of a millimeter thick, underneath which they are composed almost entirely of closely packed neutrons called neutron matter [5] with a slight dusting of free electrons and protons mixed in. This degenerate neutron matter has a density of about 6.65 × 10 17 ...

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