Chaotic Hyperion


hyperion20161206Saturn’s moon Hyperion tumbles as it orbits the planet. Hyperion’s 270 km long spin axis has a chaotic orientation in time, meaning that it is essentially impossible to predict how the moon will be spinning in the future. It’s one of a very few known bodies with such chaotic spins.

Image Credit: NASA

Prometheus


prometheusPrometheus is one of the small shepherd moons associated with Saturn’s rings. Surface features on the tiny moon are visible in this image from the Cassini spacecraft. Most images of Prometheus are taken from too far away to show individual craters. Click the image to embiggen it.

Image Credit: NASA

Ring Details


ring-detailsSaturn’s rings are made up of many smaller ringlets that blur together when seen from a distance, but when imaged up close, their structures show a wide range of variation. Ring scientists are debating the nature of these features—whether they have always appeared this way or whether they have evolved over time.

Image Credit: NASA