 These values are unusually high for an inner satellite and can be explained by the past influence of the innermost Galilean satellite, Io; in the past, several mean-motion resonances with Io would have passed through Thebe's orbit as Io gradually receded from Jupiter, and these excited Thebe's orbit.The orbit of Thebe lies near the outer edge of the Thebe gossamer ring, which is composed of the dust ejected from the satellite.After ejection the dust drifts in the direction of the planet under the action of Poynting–Robertson drag forming a ring inward of the moon.