Clouds drifted in and out of the D.C. area before dawn Friday, offering enough open sky for photographers around the region ...

The multi-colored clouds are known as polar stratospheric clouds (PSCs) and look similar to auroras blazing in the sky. However, these rainbow clouds aren’t auroras as you might think.

New images captured by NASA's Curiosity rover show colorful clouds in the sky over Mars. The images were captured by the rover's Mastcam, which NASA's Jet Propulsion Laboratory compared to the ...