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1. Dictionary

   planet

   /ˈplanɪt/

   noun

   • 1. a celestial body moving in an elliptical orbit round a star.
   • ▪ the earth: "no generation has the right to pollute the planet"
   • ▪ a celestial body distinguished from the fixed stars by having an apparent motion of its own (including the moon and sun), especially with reference to its supposed influence on people and events: "the planets are presently influencing you in a positive way"

   Word Origin Middle English: from Old French planete, from late Latin planeta, planetes, from Greek planētēs ‘wanderer, planet’, from planan ‘wander’.

   Scrabble Points: 8

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2. science.nasa.gov › solar-system › planetsWhat is a Planet? - NASA Science

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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 […]

3. www.merriam-webster.com › dictionary › planetPlanet Definition & Meaning - Merriam-Webster

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   Learn the origin, synonyms, examples, and history of the word planet, which means any of the large bodies that revolve around the sun in the solar system. Find out how the definition of planet changed over time and what are the phrases containing planet.

4. Videos

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     2:02

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     What Is a Planet?

     Apr 6, 2018

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     4:55

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     Planets: What Exactly is a Planet? | Science Trek

     Oct 19, 2020

     9K Views

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     science.nasa.gov

     What is a Planet? - NASA Science

     Sep 29, 2023

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5. spaceplace.nasa.gov › planet-what-is › enWhat Is a Planet? | NASA Space Place – NASA Science for Kids

   spaceplace.nasa.gov › planet-what-is › en

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   Jun 27, 2019 · Learn how scientists define a planet based on three criteria: orbiting a star, being spherical, and clearing its orbit. Explore the formation of planets in our solar system and beyond, and the debate over brown dwarfs and exoplanets.

6. en.wikipedia.org › wiki › PlanetPlanet - Wikipedia

   en.wikipedia.org › wiki › Planet

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   Planets in the Solar System. According to the IAU definition, there are eight planets in the Solar System, which are (in increasing distance from the Sun): [2] Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Jupiter is the largest, at 318 Earth masses, whereas Mercury is the smallest, at 0.055 Earth masses.

7. People also ask

   What is a 'planet'?

   • This applies, in particular, to the designation 'planets.' The word 'planet' originally described 'wanderers' that were known only as moving lights in the sky. Recent discoveries lead us to create a new definition, which we can make using currently available scientific information.

   What is a Planet? - NASA Science

   science.nasa.gov/solar-system/planets/what-is-a-planet/

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   How does a planet form?

   • Every planet began its existence in an entirely fluid state; in early formation, the denser, heavier materials sank to the centre, leaving the lighter materials near the surface. Each therefore has a differentiated interior consisting of a dense planetary core surrounded by a mantle that either is or was a fluid.

   Planet - Wikipedia

   en.wikipedia.org/wiki/Planet

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   What is a planet in astronomy?

   • 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 (IAU) - a group of astronomers that names objects in our solar system - agreed on their own definition of the word "planet."

   What is a Planet? - NASA Science

   science.nasa.gov/solar-system/planets/what-is-a-planet/

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   Why is it important to define a planet?

   • Defining the term planet is important, because such definitions reflect our understanding of the origins, architecture, and evolution of our solar system. Over historical time, objects categorized as planets have changed. The ancient Greeks counted the Earth's Moon and Sun as planets along with Mercury, Venus, Mars, Jupiter, and Saturn.

   What is a Planet? | Planets – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/in-depth.amp

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   What does planet mean in a sentence?

   • Commonly Misspelled Words Quiz Autocorrect can’t save you now. The meaning of PLANET is any of the large bodies that revolve around the sun in the solar system. How to use planet in a sentence. Did you know?

   Planet Definition & Meaning - Merriam-Webster

   www.merriam-webster.com/dictionary/planet

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   Where does the word planet come from?

   • The word planet comes from the Greek πλανήται (planḗtai) 'wanderers'. In antiquity, this word referred to the Sun, Moon, and five points of light visible to the naked eye that moved across the background of the stars—namely, Mercury, Venus, Mars, Jupiter, and Saturn.

   Planet - Wikipedia

   en.wikipedia.org/wiki/Planet

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8. dictionary.cambridge.org › dictionary › englishPLANET | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › dictionary › english

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   PLANET definition: 1. an extremely large, round mass of rock and metal, such as Earth, or of gas, such as Jupiter…. Learn more.

9. solarsystem.nasa.gov › planets › in-depthWhat is a Planet? | Planets – NASA Solar System Exploration

   solarsystem.nasa.gov › planets › in-depth

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   The New Definition of Planet. The New Definition of Planet. Here is the text of the IAU’s Resolution B5: Definition of a Planet in the Solar System: Contemporary observations are changing our understanding of planetary systems, and it is important that our nomenclature for objects reflect our current understanding.

10. www.britannica.com › science › planetPlanet | Definition, Characteristics, & Facts | Britannica

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    4 days ago · planet, (from Greek planētes, “wanderers”), 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. In addition to the above description, some scientists impose additional constraints regarding characteristics such ...