- antwrp.gsfc.nasa.gov/apod/ap960304.html
- antwrp.gsfc.nasa.gov/apod/ap960408.html
- antwrp.gsfc.nasa.gov/apod/ap960303.html
- Ariel is a relatively small satellite and is the brightest moon of Uranus. It has long rift valleys and is marked with craters.solarviews.com/eng/ariel.htm
- antwrp.gsfc.nasa.gov/apod/ap960407.html
- Umbriel is the darkest satellite of Uranus. It is about the same size as Ariel and has about the same density. The surface appears to be old with large craters. Near the top is a bright ring called the fluorescent cheerio.solarviews.com/eng/umbriel.htm