Quasi-satellite facts for kids
A quasi-satellite is an astronomical object that crosses a planet's orbit during its own orbit.
A quasi-satellite's orbit around the Sun takes exactly the same time as the planet's orbit. Its eccentricity is different from the eccentricity of the planet. The orbits of quasi-satellites are unstable and over time they will break free from the planet's gravity.
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Quasi-satellite Facts for Kids. Kiddle Encyclopedia.