More than just a game for stargazers and Trekkies:
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Universe Sandbox
Interactive Astronomy Software for Everyone
http://universesandbox.com/
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FAQ
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What happens when the trial is over?
* Universe Sandbox reverts to the free-forever system viewer.
* You can continue to open and view systems, but you can no longer interact with them.
* You'll no longer be able to control gravity, add new bodies, or change properties.
* Just buy a product key to restore all the interactive features.
May your journey be free of incident!
graylox
