十大最壮观宇宙美景:马头星云VS弓形北极光(3)

曝光30分钟的恒星轨迹
当地球旋转时,这张长期30分钟曝光时间的照片拍摄的是地球南极的恒星轨迹。图片底部的橙色发光区域是由于来自街道光线和人工照明的光污染。
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