The area near clouds is often classified as ‘clear sky’, but a new study demonstrates the potential biases of misclassifying ...

Noctilucent clouds shimmer above a hill on Mars in this image from the Curiosity rover from late ... [+] December. The image comes from Dec. 23. The rover snapped multiple pictures of clouds that day.

When a veil of clouds drapes the sky, be on the lookout for sun dogs -- pieces of rainbows that glow to the left and right of the sun. They often appear in pairs when sunlight shines through thin ...

With each passing night as, the crescent slowly widens and it begins to appear against a progressively darker background, its ...