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 ...

Using new data from NASA’s Cassini spacecraft, researchers believe they have solved a longstanding mystery of solar system science: the length of a day on Saturn. It’s 10 hours, 33 minutes and 38 ...

Saturn’s iconic rings will seemingly vanish from view on Sunday, March 23. The gas giant’s rings have been gradually tilting edge-on, as seen from Earth, for the past seven years, and this weekend, ...