a star begins its life as a nebula, a large ionized gaseous cloud that eventually coalesces and ignites.
after some millions of years of life, the star then 'dies;' either it simply dwindles away to a white dwarf and then a frigid black dwarf, or it lights up and explodes into a cosmic inferno known as a supernova. when a supernova finally clears, all that remains is a black hole.
black holes consist of a star's mass compressed into an infinitesimal point, creating such a tremendous gravitational pull that light cannot escape and the very fabric of spacetime is warped to the breaking point like a saranwrap trampoline that's had a bowling ball dropped on it.
stephen hawking invented them, or something.
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