The image above was taken last December by the Cassini spacecraft. The soft colors of Saturn are a strong contrast with the colorless moon. The European Space Agency provides more details on the photo:
The images used to create this view were obtained with the Cassini-Huygens wide-angle camera at a distance of approximately 603 000 kilometres from Dione through a filter sensitive to wavelengths of ultraviolet light.Giovanni Domenico Cassini discovered Dione in 1684, it being one of the four moons he identified and named Sidera Lodoicea, or "the stars of Louis," to honor king Louis XIV. A comparison of Dione to the Earth and its moon is shown below.
Image Credit: NASA/JPL/Space Science Institute
