十万个为什么·科学启蒙30篇（3）

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太空中有能吞掉光的地方

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