Another Free Space Pun: Space Engine
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Lewie pointed me towards this pretty thing earlier today. It's called Space Engine, and it's a "free universe simulator". Not exactly a game, then, but close enough to my general interests in space things and simulatory things to go up here. There are a bunch of other similar projects out there, but this one is particularly pretty and versatile, as you can see in the video below. Just need some recordings of Carl Sagan rambling about the size of the universe to play over the top of this and you're in space-nerd nirvana.
Watch on YouTube