I didn’t believe in the “green flash” so many people said they see at sunset, until I saw one on St. Barth a few years ago.

An astronaut’s photo from the International Space Station captures crepuscular rays and cumulonimbus clouds, revealing a ...

These rings form as the sun’s rays are refracted and reflected through ice crystals, found within high level cirrus clouds. This refraction/reflection creates a ring of light in a radius of 22 ...

Sun damage on skin doesn’t take a break in autumn/fall or winter. Discover the surprising risk and how to prevent dark spots ...

These clouds hang at an unusually high altitude, which suggests they are probably made of carbon dioxide ice — also known as dry ice. NASA released the eerie image on Monday. The sun's rays ...

The sun? Then in 1912, Austrian physicist Victor Hess flew ... However, much closer to home, you can actually build your own cloud chamber and see cosmic ray trails yourself for about $100! Here’s ...

I have a question about suntanning. First off, I want to say that I get yearly skin cancer checks, love the sun, and hardly ...

The full moon this week will be a spectacular Beaver Supermoon—the last in a series of four supermoons this year. Here's how ...

Those in the northern tier could be in for a Northern Lights show Sunday and Monday nights after charged particles were sent ...

While the sun provides essential vitamin D and supports wellness, its ultraviolet (UV) rays can also have negative effects on ...

Solar flares emit radiation, mostly in the form of ultraviolet light and X-rays ... mass ejections, or clouds of plasma and charged particles, that emerge from the sun's outermost atmosphere ...

While sunsets on Mars are uniquely moody, NASA 's Curiosity rover has captured a stunning image of a martian sunset, featuring light rays that illuminated a bank of clouds as the sun set over the ...