While astronomy and clouds don’t usually mix, a rare type of atmospheric phenomenon, called noctilucent or night-shining ...

The fleeting glow of noctilucent clouds is once again making its appearance in Earth’s upper atmosphere, signaling the start ...

Noctilucent clouds, Earth's highest clouds, shine blue in the twilight sky from late May to August in the northern hemisphere ...

with blue skies, strong winds, swift-sailing clouds and, at daylight’s end, a blazing spectacle of a sunset. It was a warm enough day, with an official high afternoon temperature of 58 degrees ...