New Scientist: Two planets found sharing one orbit http://www.newscientist.com/article/dn20160-two-planets-found-sharing-one-orbit.html Popular Science: Two Planets Discovered Sharing the Same Orbit http://www.popsci.com/science/article/2011-02/two-planets-discovered-sharing-same-orbit
Architecture and Dynamics of Kepler's Candidate Multiple Transiting Planet Systems
http://arxiv.org/abs/1102.0543Giant Impact Hypothesis: http://en.wikipedia.org/wiki/Giant_impact_hypothesis
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