Noctilucent Clouds and Comet NEOWISE.

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 clouds are not new to the northern high-latitudes. Comet NEOWISE is though. Also known as C/2020 F3, the comet was discovered in March by the Earth-orbiting Near Earth Object Wide-field Infrared Survey Explorer ( NEOWISE ) satellite. It's now emerging in morning twilight only just visible to the unaided eye from a clear location above the northeastern horizon .