An interesting video by Space Matters on neutron stars, the collapsed cores of massive supergiant stars which had total masses of between 10 and 25 times the mass of our Sun (M☉). They are the smallest and densest known stellar objects, except for Black Holes, having a radius of about 10 kilometers (and a mass of about 1.4 M☉).
They are called neutron stars because, well, their gravitational pressure is so gigantic that atomic nuclei and their electrons are forced onto one another and combine to form neutrons. Further collapse is prevented by a phenomenon called neutron degeneracy pressure.
Nite.
MFBB.
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