十万个为什么·科学启蒙30篇（3）
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Space Has Places That Swallow Light
太空中有能吞掉光的地方
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Black holes form when massive stars collapse under their own gravity at life’s end.
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Their pull is so strong that nothing — not even light — can escape past a point called the event horizon.
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We can’t see black holes directly, but we spot them by watching stars orbit empty space.
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Gas falling toward a black hole heats up and glows brightly before vanishing forever.
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Supermassive black holes live at the center of almost every big galaxy, including ours.
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A black hole’s size depends on how much mass it has pulled in over time.
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If you floated near one, time would feel slower for you than for friends far away.
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Scientists use radio telescopes to map invisible structures around these mysterious space objects.
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No black hole is close enough to pull Earth — the nearest is over 1,500 light-years away.
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Studying them helps us understand gravity, space, and how galaxies grow and change.