The major satellites of gas giant planets are found farther out than their rings primarily due to the processes of formation and stability. Rings are composed of smaller particles that are more susceptible to tidal forces and can be influenced by the planet's gravity, leading to their formation closer to the planet. In contrast, larger moons formed from the accretion of material in the protoplanetary disk or through capture events, requiring a more stable environment away from the strong tidal forces that would disrupt their formation if they were closer. Additionally, the gravitational interactions and dynamics in the outer regions allow for the stability of larger bodies compared to the transient nature of rings.
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