Saturn's moon Hyperion is the largest of the planet's irregular, non-spherical moons. Nearly every inch of its surface is covered in craters, causing it to look like a jagged, gray sea sponge. Hyperion is also less dense than water, and is thought to contain porous pockets of water ice. The view was obtained during Cassini's close flyby on Sept. 26, 2005.
Scars on Hyperion
Hyperion looks as though it has a long history of collisions with small bodies. It also rotates chaotically in its orbit, "tumbling unpredictably through space," according to NASA.
Hyperion, along with its sister moons Phoebe and Iapteus, all bear signs of past collisions. The gravity of Saturn can smooth out the surface of a cratered moon over time, but these are three of Saturn's most distant moons, which is partly why their scars remain.
Cassini captured this image on Aug. 25, 2011.
Saturn's moon Dione is notable for the "wispy" features that stretch across its surface. These are fractured areas that stretch for up to tens or hundreds of miles, cutting across plains and craters, according to NASA.
These fractures create deep ice canyons (some of them are several hundred meters high), that appear lighter because the fracturing causes the darker surface material to fall off, revealing light-colored water ice underneath. These could be similar to the "stripes" on Saturn's moon Enceladus.
Dione, Up Close
Dione's surface was seen in detail by the Cassini spacecraft during a flyby in June 2015.
Dione and Rhea
The Cassini spacecraft captures a far-off look at the wispy features on the surface of Dione, with the cratered moon Rhea taking up the top half of the image. Saturn's rings are also visible.
Saturn's moon Mimas bears more than a small resemblance to the fictional Death Star from the Star Wars Universe. The moon's most distinct surface feature is the enormous Herschel Crater, which is 80 miles (130 km) across, or about one-third of the diameter of the moon itself.
The Great Crater
Subtle color differences on Saturn's moon Mimas are apparent in this false-color view of Herschel Crater captured in 2010 during NASA's Cassini spacecraft on its closest-ever flyby of that moon.
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