When a giant star dies in a supernova explosion a stellar core is left. If the stellar core has a mass ranging from 1.4 to 3 solar mass, it collapses, as gravity is so strong that electrons and protons combine to form neutrons giving birth to a neutron star. It does not collapse further because of Neutron degeneracy pressure.
A neutron star is one of the densest objects in space. Just imagine compressing sun to the size of Manhatten that is around 20 km. If you takeout a sugar cube amount of neutron star it will weigh about 3 billion tons.
As the name suggests neutron stars are composed almost entirely of neutrons. Its immense gravitational field which is 200 billion times that of the earth, combines electrons and protons to form neutrons. Neutron stars are very hot having a surface temperature of around 600 thousand K. Its magnetic field ranges from 100 million to 1 quadrillion times stronger than the field of the Earth.
0:00 Pulsar Size Comparison
2:17 What are Neutron Stars?
3:42 Difference between Pulsar, Millipulsar, and Magnetar
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