While most clouds form in the troposphere between Earth’s surface and about 11 miles above the ground, these appear in the mesosphere, up to 50 miles high.

Thanks to data from the SPICAM Ultraviolet and Infrared Atmospheric Spectrometer onboard Mars Express, a fleeting layer of clouds have been discovered at an altitude between 80 and 100 kilometres.

A recent study reveals that clouds over the Himalayas and Western Ghats are transporting toxic heavy metals from polluted ...

Around this time, the sun never dips far below the horizon, leaving it well placed to illuminate the high-altitude icy particles as night settles in. Noctilucent clouds most commonly appear ...

Noctilucent clouds over the Baltic Sea, as seen from Germany in 2019. Typically seen in polar regions, the clouds are increasingly appearing at mid- and low latitudes. Matthias Süßen via ...