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 beautiful sunshine and blue sky we saw on Thursday fade on Friday as a cold front approaches. Temperatures will drop into ...

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 ...

Altitudes, landscapes and climates change dramatically as you move across the globe, but one factor remains nearly ubiquitous. All of Earth's diversity is blanketed under a blue sky. But why is the ...

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 ...

THE blue color of the sky on a clear day is familiar to all. And yet how many have considered the source of this delicate mantle of azure which Nature spreads over the dome of the heavens? The ...

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 ...

It looks like a ring of blue fire in the sky. But, in fact, that swirl of sapphire over the North Pole and Greenland is actually ice — that, and a bit of pulverized meteor dust. 'Miracle' photo ...

Ever seen a sunrise from the moon? These space images will leave you marveling at our planet and our universe. Freelance writer Amanda C. Kooser covers gadgets and tech news with a twist for CNET.