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Alan+Shield's activity in the archive.
http://www.arrl.org/news/stories/2001/08/10/4/
Also, Neptune and Pluto are in a 3:2 resonance, which is another reason they won't collide. http://www.seds.org/nin epl anets/nineplanets/plutodyn.html
http://www.arrl.org/news/stories/2001/08/10/4/
Also, Neptune and Pluto are in a 3:2 resonance, which is another reason they won't collide.
http://www.seds.org/nin epl anets/nineplanets/plutodyn.html