Looks cool. Thanks for the link. And if any modellers or programmers are hanging around, on the bottom of the FAQ it says: How can I contribute to Celestia? There's much to explore in Celestia, but it's nowhere near being complete. If you're a programmer and would like to contribute code to Celestia, you should sign up for a free SourceForge account. All source updates to Celestia are made through SourceForge's CVS server. The project page is here. If you've got 3D modeling skills, Celestia needs some high-quality models of spacecraft, as Viking, Voyager, Apollo, Giotto, and many others are still missing from Celestia's universe.