为什么星星会闪烁？夜空中的简单科学
On a clear night, you can see stars high above. They shine with a steady light. But they seem to twinkle. This twinkling is not real. It is a trick of the air around Earth.
Star light must travel very far to reach your eyes. It travels through space. Then it enters the air around our planet. This air is always moving. Warm air rises and cold air sinks.
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