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As the air in the earth's atmosphere swirls around over our heads, the light passing through it from space to earth is continually bent in different directions. This causes a rippling effect, like when you observe something underwater, or look down a hot road in the summer. To our eyes, the stars appear to twinkle.
当大气中的空气在我们上方旋动，光线穿过大气层，从太空照射到地球，并且往不同方向折射，这样便形成了涟漪般的效应，这就好像你看着水底下的东西，或是在夏天里望着炙热的马路，道理是一样的。所以，在我们眼中，星星在闪烁。
Just like people, stars also have lifespan. A star keeps the same color and shape for most of its life. But when it gets very old, it swells into what is called a red giant. After reaching this stage, some stars begin to cool down and grow dim. Other stars explode into spectacular supernovas.
就像人类一样，星星也有平均寿命。星星的一生大多数会维持相同的颜色与形状，但是当时间一久，就会膨胀变成红色的巨星，这时，有些星星的温度会开始下降，光度也随之下降。有些星星会爆炸，形成壮观的超新星。
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