Tại sao các vì sao nhấp nháy?
Các ngôi sao trên bầu trời nhấp nháy là bởi ánh sáng của chúng phải xuyên qua bầu khí quyển bảo vệ trái đất, vốn luôn biến động về nhiệt độ và mật độ.
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