clouds

In an unexpected first, researchers have discovered ammonia in the troposphere, Earth's lowest atmospheric layer, a new study finds.

Bird poop is a messy nuisance in the Arctic, but the droppings from seabirds actually have a beneficial effect: slightly cooling the region threatened by climate change, a new study finds.

Despite recent speculation, strangely shaped clouds over the Bermuda Triangle are likely not the cause of unexplained disappearances.

A new satellite image shows complicated cloud patterns off the coast of Angola and Namibia.

Stunning new maps document a global year in the clouds in more intimate detail than ever before.

You're never alone when you're surrounded by your microbial cloud.

A so-called fire rainbow filled the sky with a haze of colors over Charleston, South Carolina, on Sunday (Aug. 16) in a recent photo posted to Twitter by Tiffany B. Jenks.

Surprisingly complicated cirrus clouds are seen by a satellite and by a scientific instrument aboard the ISS, matching data to a high-flying view.

Luminous, filamentous noctilucent clouds glow over the North Pole in new NASA images.