It’s mostly lasers and big black boxes. 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 ...

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 ...

Perhaps the muted sky blue color reflects a Bay Area late winter/early spring frequent layer of clouds like we typically see here in Seattle. "Who cares?" you might find yourself saying.

Early risers across Northeast Florida were treated to an interesting sight Wednesday morning: wispy, glowing clouds in the eastern sky just before ... electric-blue clouds seen from the ground ...

A serene blue lake lies nestled between towering mountain peaks, its surface mirroring the shifting hues of the sky. Wisps of clouds drift gently along the rugged slopes, adding a dreamlike ...

X/@UHN_Plus The fireball was seen streaking across the atmosphere, illuminating the overcast clouds in the night sky with a bright neon blue color for about 7 seconds. X/@UHN_Plus The meteor was ...

If you’ve referred to something rare happening “once in a blue moon,” that time is now. The moon won’t be blue when it rises into the skies Wednesday evening, but the blue moon refers to ...