Formation of the Solar System

My guess is that Pluto, Eris, Triton, and Titan were moons of the sun when it was the size of Jupiter. When it grew to the size of a brown dwarf it formed Neptune, Ouranos, Jupiter, and Satyrn. Then later it formed Mars, Earth, Venus, and Mercury.

Earth formed four moons: The moon, Theia, Ceres, and one that no longer exists.