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Black Holes and the Penrose Diagram
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What is a black hole?
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A region of spacetime where gravity is so strong that nothing, not even light, can escape.
A region of spacetime where gravity is so weak that nothing, not even light, can escape.
A region of spacetime where gravity is so strong that everything, even light, can escape.
A region of spacetime where gravity is so weak that everything, even light, can escape.
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