Final answer:
Black holes are objects of immense gravity formed from collapsing stars with a singularity at the core and an event horizon where nothing escapes.
Explanation:
Black holes are objects formed by the collapse of massive stars, creating a singularity with infinite density at the center and an event horizon where nothing, not even light, can escape. The term 'black hole' comes from the fact that they absorb all light due to their extreme gravitational pull.
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