SpaceEngine

Free space simulation software that lets you explore the universe in three dimensions, starting from planet Earth to the most distant galaxies. Read more about SpaceEngine
SpaceEngine SpaceEngine Video
Space Engine - 0.9.7.2 - Nothing To Do But Explore Video
The day after Christmas a new update to Space Engine was released, seems like a perfect excuse to immerse myself in this virtual universe for some more exploring. Space engine offers an entire universe, partly based off real data and the rest of it filled in by procedural content generation. There's no gameplay, just pure exploration. http://spaceengine.org