StartsWithABang writes: In 2005, scientists put forth the Nice Model to explain the configuration of the Solar System's planets. It was thought that the outer planets, Jupiter in particular, migrated through the inner Solar System, and were then pulled back out by the presence of the outer giants, causing the late heavy bombardment of the terrestrial planets as it crossed the asteroid belt. But not only are extra gas giants that have since been ejected required to explain the outer worlds, but the migration would have ejected the inner, terrestrial worlds, indicating that the rocky planets finished forming after the gas giants were already in place. R.I.P., Nice Model: 2005-2015.
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