夜光云与NEOWISE彗星
2020年7月9日 Noctilucent Clouds and Comet NEOWISE Image Credit & Copyright: Emmanuel Paoly Explanation: These silvery blue waves washing over a tree-lined horizon in the eastern French Alps are noctilucent clouds. From high in planet Earth’s mesosphere, they reflect sunlight in this predawn skyscape taken on July 8. This summer, the night-shining clo...