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.

This article uses material from these Wikipedia articles which were released under the Creative Commons Attribution-Share-Alike License 3.0: Neutron_star

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