I understand that it is a celestial object of very small radius (typically 18 miles/30 km) and very high density, composed predominantly of closely packed neutrons. Neutron stars are thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole.


  1. How can a neutron star have a magnetic field when its particles are neutral?
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    $\begingroup$ Not an exact duplicate, but the answer is there: neutron stars are mostly neutrons but do have some charged constituents. $\endgroup$ – rob Jun 3 '18 at 17:12
  • $\begingroup$ The answer is not there. It is : "The origins of the strong magnetic field are as yet unclear." en.wikipedia.org/wiki/Neutron_star#Magnetic_field $\endgroup$ – my2cts Jun 3 '18 at 20:21
  • $\begingroup$ There are good answers here: physics.stackexchange.com/questions/207807/… $\endgroup$ – my2cts Jun 3 '18 at 20:22
  • $\begingroup$ Neutrons are electrical neutral elements but have a magnetic dipole moment. So it is not surprising to me that the neutrons of a neutron star have a common magnetic field. $\endgroup$ – HolgerFiedler Aug 22 '20 at 6:32