Cassini Returns Images of Saturn's Moon Rhea
Posted on March 12, 2013
NASA's Cassini spacecraft captured new images of Saturn's moon Rhea during its close flyby of Rhea on March 9, 2013. Cassini flew by Rhea at an altitude of 620 miles (997 kilometers). Rhea's crated surface reveals the moon has suffered many collisions with space rocks. You can find more Rhea images here.
NASA noted one curious feature on Rhea, which scientists are still trying to understand. The feature, pictured below, is described as "a curving, narrow fracture or a graben, which is a block of ground lower than its surroundings and bordered by cliffs on either side." NASA says this feature looks "remarkably recent."