exploring the universe

This is a software which lets you explore the universe, travel to stars and galaxies. I guess it is more informational than google earth and run the demo after you have installed the program.

just go to the official homepage of Celestia and download the software. it is really amazing. a portable version of Celestia is also available here. but please make sure your computer is fast enough to run the software. i also recommend you to update your graphic card driver before running the program.