北极光：太阳送来的天空魔法
In cold places near the North Pole, the night sky sometimes turns green, pink, and purple. The lights move slowly like a giant curtain. Many people travel far to see this magic. It is called the aurora borealis, or the northern lights.
The lights come from the sun. The sun sends out a stream of tiny particles, or small bits, into space. We call this the solar wind. When the solar wind reaches Earth, the particles meet our air. The air then glows with bright colors.
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