I find most of my interesting links through neatorama.com or geekologie.com
Today, neatorama presented me with this nifty little appllication to explore planetary orbits...
It made me rethink the orbit of our moon. I think of the moon as traveling in circles around the Earth... But this application made it clear that, much like a spirograph, the moon travels in a squiggly orbit... FUN!
Tinker with mass, direction, and velocity and see how long your solar system can survive!

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