Have you ever gazed up at the sky and wondered why clouds look so incredibly different from one another? One moment, you spot ...

Puffy cumulus and drab stratus are mainstays in the scenery of our everyday life, but there are some extraordinary clouds ...

But the behavior of these lab-based cloud particles mimics the behavior of cloud particles in massive sky-sweeping clouds, only in miniature. “Of course, we don’t grow them at quite the same scale you ...

Aurora chaser and photographer Harlan Thomas ( @TheAuroraGuy) was about 18.5 miles (30 kilometers) north of Calgary along a ...

On Saturday, in Washington, November flung off the gray mask it wore on Friday and once more dazzled the city with the glories of late autumn, with blue ... many clouds shared the sky, they ...

clouds don't form as easily and haze doesn't clog our urban centers. The result is a crystal clear view of the azure expanse above. The warm hues of fall foliage naturally complement the blue sky.

Bright blue-white noctilucent clouds danced over the town of Nykøbing Mors in Denmark just before dawn, just when this spectacular photo was taken. Night sky photographer Ruslan Merzlyakov ...

We had a special treat Wednesday morning due to noctilucent clouds that are rarely seen in the Florida sky. Noctilucent clouds ... characteristic iridescent blue hue. This striking color arises ...