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- DictionaryPlan·et/ˈplanət/
noun
- 1. a celestial body moving in an elliptical orbit around a star.
noun
There is evidence that the formation of the Solar System began about 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed. Wikipedia