Neutron Star
A neutron star is the dead remnant of a massive star. A star reaches the end of its life when it uses up all of its nuclear fuel. Without fuel, it cannot undergo nuclear fusion, the process that pushes matter outward from the star's core and provides a balance to its immense gravitational field. The fate of a dying star, however, depends on that star's mass.
A medium-sized star, like the Sun, will shrink and end up as a white dwarf (small, extremely dense star having low brightness). The largest stars—those more than three times the mass of the Sun—explode in a supernova and then, in theory, undergo a gravitational collapse so complete they form black holes (single points of infinite mass and gravity). Those stars larger than the Sun yet not more than three times...
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