Planets: Difference between revisions
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There are three main categories of | There are three main categories of [[:Category:Planets|planets]]: [[Terrestrial Planet|Terrestrial planets]] (Earth-like worlds), [[Ocean Planet|Ocean Planets]] (water worlds) and [[Gas Giant|Gas Giants]]. | ||
The term planet refers to celestial bodies orbiting a [[star]] with a [[gravity]] in a specific range. The gravity of a planet has to be strong enough to hold fluids in a stable state (hydrostatic equilibrium) which prevents them from escaping the planet and low enough to prevent nuclear processes to start as in stars. | The term planet refers to celestial bodies orbiting a [[star]] with a [[gravity]] in a specific range. The gravity of a planet has to be strong enough to hold fluids in a stable state (hydrostatic equilibrium) which prevents them from escaping the planet and low enough to prevent nuclear processes to start as in stars. | ||
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Some astronomical bodies, we call planets, are not considered as planets by this definition. [[Moons]] are natural satellites orbiting a planet and do not fall into the category of planets. However, some natural satellites are considered as planets because they fit their definition.<ref>https://www.universetoday.com/85749/is-the-moon-a-planet/</ref> | Some astronomical bodies, we call planets, are not considered as planets by this definition. [[Moons]] are natural satellites orbiting a planet and do not fall into the category of planets. However, some natural satellites are considered as planets because they fit their definition.<ref>https://www.universetoday.com/85749/is-the-moon-a-planet/</ref> | ||
== Terrestrial | == [[Terrestrial Planet|Terrestrial Planets]] == | ||
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[[Category:Celestials]] | [[Category:Celestials]] | ||
== | == [[Ocean Planet|Ocean Planets]] == | ||
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!Image | !Image | ||