Neptune has far fewer satellites than other gaseous giants, and most of the mass of the system is concentrated in Triton. But it is a moon that orbits in the opposite direction at a strange angle and that astronomers suspected that it is actually a dwarf planet expelled from the Kuiper Belt. Now, new simulations from an international team have confirmed it and, in addition, it has calculated how the satellites of the gas giant were before the arrival of the destructive invader. The clash with some even helped to stop Triton.

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