Universe Sandbox can simulate our solar system if something extra was added to it, like an extra Nibiru planet colliding with the Earth or two comets colliding with each other. If we add two random extra suns, one a small red dwarf like Proxima and the other roughly the size of our real Sun, the situation rapidly gets out of hand and most planets are either fried or ejected from the solar system into cold space. The clear result is that the gravity of more than one sun in our solar system would destroy all the planets, and we can rule out the possibility that we have more than one Sun.

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