"is it possible that humans could start to live on the moon? Such as start colonies there?"
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Question
Will pluto and neptune ever collide since thier orbits seems to cross, if so when? and if so what would that collision be like?
No, Neptune and Pluto cannot get close to each other. They are in what astronomers call resonance orbits. Pluto lies in the 3:2 mean motion resonance of Neptune: for every three orbits of Neptune around the Sun, Pluto makes two. This is a stable configuration, so they will remain "safe" from any future collisions.
David Morrison
NAI Senior Scientist
March 4, 2009
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