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

The Earth has a fascinating atmosphere that contains several unique layers The Troposphere is the layer that we live in, it starts at the surface but the height often varies to about 9-12 miles up.

When a volcano in Tonga erupted on January 15, it gave satellites their first glimpse at a plume of volcanic ash shooting into the mesosphere, the third layer of Earth's atmosphere. According to ...