I would like to inform you about my astronomy software VRMars-Spirit - The Red Planet Mars 3D presenting the Mars Exploration Rover Spirit Mission with the aid of virtual reality. It is powered by my own technology named VRPresents that gives the user the feel of being on the surface of Mars.

Here's the link where you can download the demos of VRMars-Spirit - The Red Planet Mars 3D:
http://www.vrmars.com/Demos.htm

Note that the demo available at Download.com service is a little bigger.

The link to some information on my software:
http://www.vrmars.com/VRMars-Spirit-The-Red-Planet-Mars-3D.htm

The link with videos presenting the software:
www.vrmars.com/Mars-Exploration-Rover-Mission-Videos.htm

VRMars-Spirit - The Red Planet Mars 3D's screen shots:
http://www.vrmars.com/ScreenShots.htm