What is a black hole?
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A black hole is an area in space where matter (what everything is made of) has collapsed in on itself.
This means a lot of matter takes up only a tiny amount of space.
A black hole has a strong gravitational pull that sucks in everything nearby – even light. Nothing can escape it.
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A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
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