挪威冬夜极光：太阳与地球的彩色共舞
In the far north of Norway, winter nights are very long. The sun does not rise for weeks. But the sky is not always dark. Sometimes, colorful lights appear.
These lights are called the aurora borealis, or northern lights. They look like soft curtains of light. They move and change in the cold air. Green and pink are the most common colors.
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