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为什么夜晚能看到星星？

夜晚能看到星星的原因有几个。首先，白天时太阳的辐射比较强，会使得星星的亮度相对较弱，难以被肉眼观察到；而夜晚时，地球转动使得太阳遮挡在地球的背后，太阳的光线不再照射到地球上，这样就能够看到宇宙中其他恒星发出的光。其次，夜晚的大气层相对较冷，可以减少大气湍流对星光的干扰，使得星星的图像更加清晰可见。

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