This video explains Tundra Orbits, and the last part of this video shows how to make one in KSP.

Below is a link to KSP
https://kerbalspaceprogram.com/

Below is Universe Sandbox
http://universesandbox.com/

Wiki: http://en.wikipedia.org/wiki/Tundra_orbit (seriously, someone needs to start adding things to it)

 

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