John Varley has written several series of well-received science fiction books. Here are some illustrations developed using Celestia.
Celestia is a free real-time 3D astronomical visualization program for Windows, MacOS and Linux. For more information, please see the Celestia home page.
The thumbnails below link to much larger screengrabs from Celestia.
Gaea orbiting Saturn.
Cel:// url for this viewpoint:
Gaea orbiting Saturn
This Addon for Celestia will provide a model of Gaea orbiting Saturn.
This addon will have been developed by Selden Ball. Detailed credits will be included in the Addon's readme file.
If you don't tell me that something's missing, unclear or wrong, I can't improve it.