Cầu vồng lộn ngược
Cầu vồng lộn ngược, một hiện tượng thiên nhiên hiếm gặp, đã xuất hiện trên bầu trời thành phố Cambridge của nước Anh hồi cuối tuần qua. Nhà thiên văn hoạc Jacqueline Mitton tại Cambridge đã chụp được hình ảnh tuyệt đẹp vào...
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