Quote:
Originally Posted by richlevy
Picked up Universe Sandbox from Steam for less than $3. It's an astronomy simulator a lot like Celestia except you can add and edit celestial objects. I already increased Earth's mass to 55 suns to see what would happen. It has some nice prepackaged tutorials.
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Kerbal Space Program is another one in that vein. It's an early release on Steam. Not complete, but very fun and has come a long way in the last year. I think I bought it for about $5.