十万个为什么·科学启蒙30篇（3）
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Stars Seem to Twinkle at Night
为什么星星会“眨眼睛”
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When I look up at night, stars seem to blink even though they shine steadily.
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This twinkling happens because air in our atmosphere moves and bends starlight.
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On windy nights, the lights dance more wildly near the horizon.
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My teacher showed us how heat waves above hot pavement blur car license plates.
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We see clearer stars from high mountains where the air is thinner and calmer.
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Planets usually don’t twinkle much because they’re closer and look like small disks.
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I point out twinkling stars to my little brother during our bedtime sky watch.
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Astronomers use special telescopes to reduce this effect for sharper pictures.
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Even though stars twinkle, their light still helps sailors and hikers find direction.
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Next time you spot one blinking, remember it’s Earth’s air playing tricks—not the star!