单词polar-lights
网络: 极光；冰岛上空的极光；极之光
The photo appears the polar lights are blue in terms of using ultraviolet camera, however, which is seen red by planet observers.
图片上的极光是蓝色的，因为照相机是紫外照相机，但是行星观测者看到的却是红色的。
polar lights can be seen in Finland.
芬兰可以看到极光。
NASA explores polar light energy NASA Mission to Seek Polar Lights" Energy Source
美国宇航局探索极光能源