Celestia -- FREE Software Which Simulates Space Travel Celestia is an application for real-time 3D visualization of space, with a detailed model of the solar system, over 100,000 stars, more than 10,000 galaxies, and an extension mechanism for adding more objects.
NOTE - Always check your Anti-Virus and Security Programs, prior to opening any downloads to make sure the files are clean of any hidden bugs. Also, Always SAVE the File, Do Not Use the Run Feature, until you check your Anti-Virus and Security Programs.
http://sourceforge.net/projects/celestia/
This is so cool! I can't wait to play with it.