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 ... phenomenon powered by the rising and falling of air ...

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

It doesn't just occur in clouds; it can appear in clear air, in the ocean, and even in the atmosphere ... to blanketing the entire sky. Cumulus clouds are the default cloud when it comes to ...