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Solar systems are commonly flat discs with planets orbiting a star in one plane, and some planets have one or more moons orbiting them. Isaac Newton did a partial study of this, only sufficient to concluded that the planetary bodies in our solar system have a degree of orbit stability that should maintain their orbits for a long time. But he did not consider other solar system stability issues, and since solar system bodies exert gravitational pulls on each other, the normal structure of a solar system can involve some instabilities, which in the case of our own solar system would chiefly seem to be ;
1. Our spherical Sun with its spherical structure and functioning would be more stable if the planetary gravitational pulls on it were basically distributed spherically. The fact that they are now distributed in one plane only, exerts destabilising pulls on the Sun. Were some planets to orbit the Sun in a plane at 90% to the present plane