iCosmo is a Screen Saver for Mac OS X that lets you view a sharp quality images of our solar system. It has same engine that come in your Mac OS X package, but it give you in high quality and in small sizes. iCosmo is free.
To install in Panther: simply double click the .saver, if required enter your password.
More info and download link here.
MacDailyNews Note: Tested in Mac OS X 10.3.2. Looks good and works… and it’s free!