Space Engine: Free Space Simulation Software

Space Engine is free simulation software that allows the user to explore the universe in three dimensions from Earth to distant galaxies. Areas of the known universe are represented using actual astronomical data and unknown regions are filled with procedurally generated objects like galaxies, stars, star clusters, nebulae and planetary systems. The known regions include data on galaxies, stars, star clusters, Solar System planets, extrasolar planets, and nebulae.

You can download the program now and support ongoing development of the program through their donation program. Check out some of the screen shots generated by the program below. It looks simply incredible.