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.星星是遥远的巨大炽热气体球。
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Their light travels through Earth’s moving air.它们的光穿过地球运动的大气层。
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Air layers have different temperatures and densities.大气各层温度和密度不同。
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This bends the light path slightly and often.这会使光路发生轻微且频繁的偏折。
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Our eyes see the light jump around quickly.我们的眼睛看到光线快速闪烁跳动。
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Planets shine with reflected sunlight and look steadier.行星靠反射阳光发光,看起来更稳定。
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They are closer and look like small disks, not points.它们距离较近,看起来像小圆盘而非光点。
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Twinkling is called atmospheric scintillation.这种闪烁现象称为大气闪烁。