clouds

Water free of minerals and impurities freezes first, pushing the cloudy parts containing the sediment (and tiny trapped air bubbles) toward the center.

They may douse themselves with a little water, but not enough to squelch the flames.

Noctilucent clouds have puzzled scientists since they were first seen in the late 19th century.

Waves, holes and swirls are just some of them!

See clouds afire with rainbow-colored light.

This month we saw oodles of animals, rare and adorable, amazing clouds and lightning and more. We picked some of our favorites for you.

Adorable animals, beautiful clouds, check out our favorites from this week.

Our favorite picks this week include weather, sea creatures, wild animals and more. Check them out.

NASA's satellite images spy contrails spreading.

Beauty from the deepest reaches of the ocean to the farthest edges of space. Check out our choices this week.