Noctilucent cloud season is upon us. If you’re in the Northern Hemisphere this summer, keep your head to the skies at sunset ...

The sky is always changing colors—from a bright blue on a clear day, to red and orange sunrises or sunsets, or multiple colors of a rainbow—there’s a lot going on that we don’t always think about.

they were touched by the last long rays of the sun, and they were painted red-orange fire. As the long bands of clouds seemed to lie one atop the other, the western sky became for a few minutes a ...

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 ...

Simply put, the sky ... Blue wavelengths are filtered out, and so the red and orange wavelengths peer through the atmosphere. In fact, everyone who is in the same latitude is looking at the same ...

And by studying the way the rays shine through the clouds, scientists can learn ... so what remains is the blue color seen in the Martian 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 ...