Thought this was pretty cool: Space Engine

Chianti

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Apr 24, 2010
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Free space simulator: Space Engine
It's like Celestia with better graphics. It also has 'procedural' (invented) objects to fill up the universe, rather than only catalogued objects.

[ame=http://www.youtube.com/watch?v=bqEnCkLPyDQ]SpaceEngine - Version 0.95 - A Seamless Voyage - YouTube[/ame] [ame=http://www.youtube.com/watch?v=Aah4uWaqcwE]SpaceEngine Version 0.95 - New Planetary Features - YouTube[/ame]

If you've got a couple of hours to waste and you're interested in astronomy and space, you could do worse than to play with this program.