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- Dictionaryplanet/ˈplanɪt/
noun
- 1. a celestial body moving in an elliptical orbit round a star.
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The Definition of a Planet The word goes back to the ancient Greek word planēt, and it means “wanderer.” A more modern definition can be found in the Merriam-Webster dictionary which defines a planet as “any of the large bodies that revolve around the Sun in the solar system.” In 2006, the International Astronomical Union […]
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. [1] .
Jul 13, 2024 · Planet, broadly, any relatively large natural body that revolves in an orbit around the Sun or around some other star and that is not radiating energy from internal nuclear fusion reactions. There are eight planets orbiting the Sun in the solar system.
Jun 27, 2019 · Scientists spent a lot of time arguing over what a planet actually is. In 2006, they came up with a definition. They said a planet must do three things. The first thing might seem obvious—it has to orbit around the sun. Second, it must be big enough to have enough gravity to force it into a spherical shape .
planet. noun. plan· et ˈpla-nət. Synonyms of planet. 1. a (1) : any of the large bodies that revolve around the sun in the solar system. (2) : a similar body associated with another star. b. : earth usually used with the. one of the hottest places on the planet. c.
The most recent definition of a planet was adopted by the International Astronomical Union in 2006. It says a planet must do three things: It must orbit a star (in our cosmic neighborhood, the Sun). It must be big enough to have enough gravity to force it into a spherical shape.
PLANET definition: 1. an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter…. Learn more.
What is a planet? A planet is a celestial body that is in orbit around a star; it has enough mass for its gravity to create a round shape; and it has cleared its neighborhood of smaller objects.
Specifically, a planet is required to be massive enough to have cleared away similarly sized objects in the neighborhood of its orbit. Using this new definition, there are eight planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Jun 29, 2015 · Classic video explaining the history, debate and continuing discussion of the definition of a planet.
