十万个为什么·科学阅读30篇（3）
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Why Do Stars Twinkle?
星星为什么会闪烁？
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Stars are huge balls of hot gas far away.
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Their light travels through Earth’s moving air.
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Air layers have different temperatures and densities.
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This bends the light path slightly and often.
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Our eyes see the light jump around quickly.
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Planets shine with reflected sunlight and look steadier.
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They are closer and look like small disks, not points.
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Twinkling is called atmospheric scintillation.