Celestia Portable 1.6.0
the portable space simulator
Celestia Portable is the popular planetarium program packaged with a PortableApps.com Launcher as a portable app, so you can view the universe in 3-D anywhere. It has all the same great features as Celestia including 3-D planet viewing, viewing over 100,000 stars, traveling beyond our galaxy, and more. It’s packaged in PortableApps.com Format so it can easily integrate with the PortableApps.com Suite. And it’s open source and completely free.
Download: Celestia Portable 1.6.0