Planets and Moons  ID: 12088

Dione's Icy Canyons

Story by Amy McDermott Released on March 10, 2016
Download Options
Once hazy features on Saturn’s moon Dione come into sharp focus in images from NASA’s Cassini mission.
Dione is one of 62 known moons of Saturn. Fuzzy photos from NASA’s Voyager missions in the 1980s revealed distinctive white streaks, called "wispy terrain," slicing across its surface. Today, thanks to sharper images captured by NASA’s Cassini spacecraft, which has orbited the Saturn system since 2004, we know that the features are a network of canyons. The canyon's ice-covered walls can tower hundreds of feet high, and in some places, stretch for hundreds of miles. But the question is how did they form? Dione's landscape sparkles with frozen water, hinting at an ancient liquid ocean hidden below ground. This internal sea might have formed cracks in the moon as it froze, or the cracks could be caused by the combined gravitational push and pull of Saturn and its other moons. Data from Cassini collected during its flybys of Dione could offer new clues. Explore the images to learn more.
Download Options
Dione's maze of towering canyons appears as bright scuffs in this image taken by Cassini.
Download Options
The canyons are mainly found on Dione's trailing hemisphere, which faces away from Saturn as the moon orbits the planet.
Download Options
Dione's canyons can extend for over 370 miles, or more than 1.3 times the length of the Grand Canyon.
Download Options
The Cassini spacecraft captured images of Dione during several close flybys made over the course of its mission.

Story Credits

Scientist:
Bonnie Buratti (NASA/JPL CalTech)

Lead Writer:
Amy McDermott (USRA)

Please give credit for this item to:
NASA's Goddard Space Flight Center
Images courtesy of NASA/JPL-Caltech/Space Science Institute

Short URL to share this page:
https://svs.gsfc.nasa.gov/12088

Keywords:
SVS >> App
NASA Science >> Planets and Moons