![](http://www.alamy.com/thumbs/6/40372FC1-F3E5-46E1-8BCA-311EEEE7C6C9/2ADM817.jpg)
Dione. Satellite image of Dione, one of Saturn's moons. Dione, also known as Saturn IV, was discovered by Giovani Cassini in 1684. It has a diameter o
Dione. Satellite image of Dione, one of Saturn's moons. Dione, also known as Saturn IV, was discovered by Giovani Cassini in 1684. It has a diameter of 1,118 kilometres and is the densest of Saturn's moons, so although it is composed mainly of water ice, it must have a large amount of denser material such as silicate rock in its interior. This image was taken as part of the Cassini-Huygens mission, which launched in 1997 with the purpose of studying Saturn and its moons. Image taken on 27 October 2004 at a distance of million kilometres by a narrow angle camera aboard the Cassini orbiter.
Size: 2505px × 2511px
Photo credit: © NASA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: 17/10/2004, 27, 2004, angle, astronomical, astronomy, black--white, camera, cassini, cassini-huygens, densest, dione, ice, icy, image, iv, mission, monochrome, moon, narrow, october, orbiter, satellite, saturn, solar, space, system, water