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aS SOON AS A STAR IS BORN, it starts fight-
ing a battle with gravity. A burning star
constantly releases enough energy to
counteract gravity’s inward pressure.
But once its fuel runs out, gravity wins:
the star implodes, and most of its mass becomes
either a neutron star—an ultradense object about the
size of a city—or a black hole. The rest explodes out-
ward, flying into space like bullets.
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