I don't know if this has been discussed here before, but just thought to give a heads up if another "space freak" like me would be interested:
"SpaceEngine - is a free space simulation software that lets you explore the universe in three dimensions, starting from planet Earth to the most distant galaxies. Areas of the known universe are represented using actual astronomical data, while regions uncharted by human astronomy are generated procedurally. Millions of galaxies, trillions of stars, countless planets!"
You can download additional high res packs for planets.
Some screens (not mine, gathered around interwebs)