The Cassini spacecraft peers through Titan's thick clouds to spy on the region dubbed "Senkyo" by scientists. The dark features include vast fields of dunes, composed of solid hydrocarbon particles ...

Saturn and its north polar hexagon dwarf Mimas as the moon peeks over the planet's limb. Saturn's A ring also makes an appearance on the far right. Mimas is 246 miles (396 kilometers) across.

In this series of images from NASA's Cassini spacecraft, a dark, rectangular hot spot (top) interacts with a line of vortices that approaches from on the upper-right side (second panel). The ...