Transcript: Each planet in the solar system is surrounded by an imaginary spherical region called the sphere of gravitational influence. For any object, such as a moon or ring particle situated within this sphere, the motions are dictated by the planet. Beyond this sphere the motions are dictated by the Sun. Thus, a moon placed just outside the sphere of gravitational influence of Jupiter would gradually drift apart from Jupiter and would move into a different orbit of the Sun. In a similar way the Sun has a sphere of gravitational influence that includes all the planets and moons of the solar system.