Cloud-watchers can talk all about the interesting shapes they've noticed over the years ... Sometimes they block the sun completely, and sometimes sun rays could still shine through.

This striking satellite image reveals a giant, near-perfect cloud circle that formed in the heart of the Pacific Ocean more ...

NASA spotted a circle of clouds over the Pacific Ocean, and the image is still breathtaking over 10 years later.

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 ...

This striking satellite image reveals a giant, near-perfect cloud circle that formed in the heart of the Pacific Ocean more than a decade ago. While this type of cloud is not uncommon, it is ...