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.

A 2014 satellite image captured a rare glimpse of a massive, eerily circular ring of clouds that formed slap-bang in the middle of the Pacific Ocean.

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 ...