Neutron star or Pulsar is the densest and tinniest star known to exist in the Universe. It is the result of the gravitational collapse of a massive star after the supernova explosion and the protons and the electrons (present in the core of the star) fusing with each other to form neutrons.
Neutron Stars are very hot and composed of neutrons only. It was firstly proposed in 1934 and was reported in 1967. It rotates at a rapid speed of approximately 642 rotations/sec. Its surface temperature is about 6 x 10^5 K.
They appear white when seen with naked eyes. Although having diameter of about 10 km they can have mass of several times the solar mass. They are also known as the "Clock of The Universe" because of their perfect and constant time of rotation (different neutron star have different time of rotation).
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