People across Europe were pretty confused last night, after a giant blue swirl appeared in the sky, lasting several minutes.

We’ve received many reports of an illuminated swirl in the sky this evening,” the British Met Office wrote on social media Monday night. “This is likely to be caused by t ...

Contrails are human-made clouds. They are streams of condensation left behind from airplanes and rockets. Exhaust leaves water vapor that freezes into tiny crystals in the cold troposphere.

A CU Boulder-led study measured water vapor in Greenland’s air, collecting data crucial for improving climate models and forecasting Arctic changes.

You know that beautiful, clear blue sky over Rochester? It’s always a welcome sight—when it happens. But have you ever noticed the thin white streaks that sometimes crisscross the sky? Many people ...

The atmosphere is thin and cold the higher up a plane goes. The exhaust from a plane's engine is much hotter than the atmosphere. The water vapor from the hot plane engine turns to ice mid-air ...

Read full article: ‘Don’t you do it’: JSO officer warned man not to drive toward him before firing shots, video shows Florida Gov. Ron DeSantis speaks at a press conference at Florida ...

Publications of the Astronomical Society of the Pacific, Vol. 116, No. 823 (September 2004), pp. 876-885 (10 pages) ABSTRACT Water vapor, while usually a small contributor to the atmospheric ...

For the first time, researchers have collected detailed measurements of water vapor high above the surface of the Greenland ice sheet. Their research ...

With the air as his canvas, a Dutch artist applies water vapor, smoke, lighting—and conjures clouds in surprising settings. Berndnaut Smilde creates clouds to photograph in odd places—here, in ...