Celestia

This programme allows you to see our galaxy and look at the 100,000+ stars in it.

If that doesn't satisfy you, Celestia can also do other things like labels, orbit systems, etc. It's definitely worth checking out. Not only astronomy enthusiasts will love it.

Within the solar system we can find planets, celestial bodies as well as the ISS, all rendered in photorealistic models.

Further extensions can be found at: http://www.celestiamotherlode.net