Of all moons surrounding gas giant Saturn, Dione is the only one with an extremely rarefied oxygen atmosphere.
At 1,122 km in diameter, Dione also has ice cliffs product of tectonic fractures.
It is the 15th largest moon and larger than all the remaining moons put together.
MEADE LX200 14" TELESCOPE, SBIG ST2K CCD CAMERA, 4-second exposure in high resolution. Processing done in CCDOps, Maxim DL5 and Adobe Photoshop CS5.