1: Introduction to Oceanography
- Page ID
- 9671
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- 1.25: Planets and Planetary Systems of the Solar System
- A planet is a large spherical celestial body moving in an elliptical orbit around a star. A planetary system is a set of gravitationally bound celestial objects in orbit around a star or star system. Planets with orbiting moons are planetary systems. The Solar System consists of four inner rocky planets, four outer gas planets, and orbiting belts of asteroids, comets, planetesimals, and other objects under the gravitation influence of the Sun.