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Black hole - Wikipedia
How regions of spacetime with gravity strong enough to trap light form, how they are detected, and what happens at the event horizon.
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How regions of spacetime with gravity strong enough to trap light form, how they are detected, and what happens at the event horizon.
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An overview of the Sun and everything bound to it by gravity: the eight planets, their moons, dwarf planets, asteroids and the distant Kuiper belt.
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