At Galaxiki.org, each star, each planet and each moon in this online fictional galaxy is represented by a wiki page that can be edited by its site members. Users can make changes to solar systems, add creatures and write stories. One of the main goals is to invent and write collaborative stories, which requires users to make sure their solar system histories remain compatible.
You can also edit most of the solar system physics, add or edit planetary rings as well. There are also social networking features including solar system ratings and comments, bookmarks, user awards and user status updates.
Galaxiki membership and editing community stars is free. Though some users want to own a personal solar system that cannot be edited by other members, you can get your own personal system by making a donation.