Clouds that look like waves? These are so beautiful I had to share them with you… … read the whole explanation, with more photos, on the EarthSky website. Picture by Paul Chartier posted on earthsky.com. These Kelvin Helmholtz clouds were photographed on
Noctilucent clouds
Amazingly white clouds even though it’s dark? It could be the effect of sunlight on the upper atmosphere illuminating the clouds (up 50k in altitude) when the surface of the earth is in darkness. These noctilucent clouds can be truly