夜光云全景
http://apod.nasa.gov/apod/image/0907/NLCcloudsallover_heden.jpgExplanation: Noctilucent or night-shining clouds lie near the edge of space. From about 80 kilometers above Earth's surface, the icy clouds can still reflect sunlight even though the Sun itself is below the horizon as seen from the ground. Usually occurring at high latitudes in summer months, the diaphonous apparitions are also known as polar mesospheric clouds and may be connected to global change in the lower atmosphere. This impressive 360 degree panorama made from 34 separate images captures an impressive display of noctilucent clouds all over the sky. It was recorded last month from Vallentuna, Sweden. The photographer reports that the display was like a noctilucent cloud storm, one of the best he's ever witnessed.
转自NASA 太壮观了，太美了！ 怎么原图那个网（apod。nasa）上不去了？ 图太小了点。 英文不好……但图很漂亮哦::070821_06.jpg::
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