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1. Oxford American Dictionary

   neutron star

   • IPA[ˈno͞oˌträn stär]

   • n.
     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.

   • noun: neutron star, plural noun: neutron stars

2. • 更多解釋

   neutron star

   • n.
     a celestial object of very small radius (typically 30 km) and very high density, composed ...

   Oxford Dictionary