http://burro.astr.cwru.edu/Academics/Astr221/StarPhys/gravity.html
http://www.eschooltoday.com/energy/kinds-of-energy/what-is-gravitational-energy.html
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EFFY FAN 
what a great collection of vibrant examples. It would be good for you to make a systems map of what’s inside the boundary (realistically but also creatively)
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