A neutron star is a type of compact star. Neutron stars are the smallest and densest stars known to exist in the Universe. With a radius of only about 11-11.5 km (7 miles), they can, however, have a mass of about twice that of the Sun.
They can result from the gravitational collapse of a massive star that produces a supernova. Neutron stars are composed almost entirely of neutrons, which are subatomic particles with no net electrical charge.
Neutron stars are very hot and typically have a surface temperature around 6×105 Kelvin. They are so dense that a normal-sized matchbox containing neutron-star material would have a mass of approximately 5 trillion tons, or 1000 km³ of Earth rock.
The gravitational field at the star’s surface is about 2×1011 times stronger than on Earth. The rotation of neutron stars can be very rapid; up to 716 times a second has been detected.
History of the Future
There are no habitables planets possible at Neutron Stars.