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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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I have always believed that hope is that stubborn thing inside us that insists, despite all the evidence to the contrary, that something better awaits us so long as we have the courage to keep reaching, to keep working, to keep fighting. -- Barack Hussein Obama
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