Tracking the rotation speed of solid planets, like the Earth and Mars, is a relatively simple task: Just measure the time it takes for a surface feature to roll into view again. But giant gas planets ...

Somewhere deep below Saturn s cloud tops, the planet rotates at a constant speed. Determining this interior period of rotation has proven extremely complicated. Now, with new Cassini results, a team ...

The smashups are thought to have occurred at least 100 million years ago, but the moons they created are new to astronomers. Share on Facebook (opens in a new window) Share on X (opens in a new window ...

Jupiter and Saturn's different polar storms reveal clues about planet interiors: Saturn has harder bottom than Jupiter.

Over the years, passing spacecraft have observed mystifying weather patterns at the poles of Jupiter and Saturn. The two planets host very different types of polar vortices, which are huge atmospheric ...