Alexandria Johnson does hard science on the most nebulous of subjects: clouds. As an atmospheric scientist and assistant professor of practice in Purdue University’s College of Science, she studies ...

The Secret Behind Light's Journey Through Space Visible light travels in electromagnetic waves, which we see as the colors of ...

Winter is an ideal time for watching the Texas sky. The sky is driest and usually cleanest during winter. Reduced water vapor, dust and smoke often leave a pristine, deep blue sky. Clouds are much ...

"I am a sugar beet smokestack in a gray, cloudy sky -- but I know there is blue sky above it all. I should never forget the blue sky." I wrote that in a notebook during an October 2007 weekend retreat ...

These clouds, which have a shimmering silvery-blue color, are mainly made of ice crystals and form at altitudes of 50–70 ...

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 captured a ...

Jon Perrett does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...

As summer gets under way in the Southern Hemisphere, electric blue clouds seeded by meteor dust begin to glow high in the sky over Antarctica’s vast icy reaches. This year, according to NASA, these ...

If you’ve noticed some strange blue clouds in the night sky recently, you’re not alone. Uncharacteristically blue nighttime clouds, usually seen over polar regions, have been visible as far south as ...

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 captured a ...