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Neutron star
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A neutron star is a collapsed core of a massive supergiant star. The stars that later collapse into neutron stars have a total mass of between 10 and 25 solar masses (M☉), possibly more if the star was especially rich in elements heavier than hydrogen and helium. Except for black holes, neutron stars are the smallest and densest known class of stellar objects. Neutron stars have a radius on the order of 10 kilometers (6 mi) and a mass of about 1.4 M☉. They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf star density to that of atomic nuclei.
Central neutron star at the heart of the Crab Nebula
Central neutron star at the heart of the Crab Nebula
Radiation from the rapidly spinning pulsar PSR B1509-58 makes nearby gas emit X-rays (gold) and illuminates the rest of the nebula, here seen in infra
Radiation from the rapidly spinning pulsar PSR B1509-58 makes nearby gas emit X-rays (gold) and illuminates the rest of the nebula, here seen in infrared (blue and red).
A computer simulation depicting a neutron star with accretion disk, spewing out X-rays through the magnetic axis
A computer simulation depicting a neutron star with accretion disk, spewing out X-rays through the magnetic axis
NASA artist's conception of a "starquake", or "stellar quake"
NASA artist's conception of a "starquake", or "stellar quake"
RX J1856.5−3754
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RX J1856.5−3754 is a neutron star in the constellation Corona Australis. At approximately 400 light-years from Earth, it is the closest neutron star discovered to date.
X-ray image of RX J1856.5−3754
X-ray image of RX J1856.5−3754
Hubble image of RX J1856.5−3754—the first direct observation of an isolated neutron star in visible light
Hubble image of RX J1856.5−3754—the first direct observation of an isolated neutron star in visible light
The polarization of the observed light in the extremely strong magnetic field suggests that the empty space around the neutron star is subject to the
The polarization of the observed light in the extremely strong magnetic field suggests that the empty space around the neutron star is subject to the vacuum birefringence.