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A study shows that there was a second sun (star) in the solar system used to orbit in the asteroid belt, between Mars and Jupiter, around 200 million years ago.
The spherical space objects that are currently classified as moons of Jupiter and Saturn used to be planets of the Second Sun!
The solar system might have been in this layout when the second sun was fully functioning. The two stars orbit each other around a common center of mass; each star had five rocky planets; the gas giants orbit the two stars... At the end of its life, when it lost most of its mass, the second sun started a new orbit around the existing sun, the orbit that is now called, the asteroid belt.
This page contains the report by parts.
To read the full report in a single page click here