Astronomy Picture of the Day——巴黎的夏至夜
A Solstice Night in Paris
Image Credit & Copyright: Loic Michel
Explanation: The night of June 21 was theshortest night for planet Earth's northern latitudes, so at latitude 48.9degrees north, Paris was no exception. Still, the City of Light had anexceptionally luminous evening. Its skies were flooded with silvery nightshining or noctilucent clouds after the solstice sunset. Hovering at the edgeof space, the icy condensations on meteoric dust or volcanic ash are still infull sunlight at the extreme altitudes of the mesophere. Seen at high latitudesin summer months, stunning, wide spread displays of northern noctilucent cloudsare now being reported.
巴黎的夏至夜
6月21日的夜晚是地球北回归线以北地区时长最短的一个夜晚，位于北纬48.9度的巴黎也不例外。尽管如此，这座光明之城仍然异常明亮。在夏至当天日落后，天空中布满了银色的夜光云。流星尘或火山灰上的冰冷凝结物悬浮在太空边缘，它们位于中气层最大高度的强烈阳光之下。在夏季的高纬度地区，我们可以看到引人注目且广泛分布的北方夜光云。
参考文献：
https://apod.nasa.gov/apod/image/1906/D7X7411-2Loic.jpg
近期文章：
Astronomy Picture of the Day——雪茄星系的中央磁场