Planets: Difference between revisions
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Some astronomical objects that meet the official criteria for planet status yet also orbit a planet are instead classified as natural satellites or [[moons]]. When the [[barycentre]] of the planet-moon system falls outside the planet, then both bodies are considered planets and part of a double-planet system.<ref>[https://www.universetoday.com/85749/is-the-moon-a-planet/ Universe Today: Is The Moon A Planet?]</ref> | Some astronomical objects that meet the official criteria for planet status yet also orbit a planet are instead classified as natural satellites or [[moons]]. When the [[barycentre]] of the planet-moon system falls outside the planet, then both bodies are considered planets and part of a double-planet system.<ref>[https://www.universetoday.com/85749/is-the-moon-a-planet/ Universe Today: Is The Moon A Planet?]</ref> | ||
Some planets are tidally locked. This means the rotation period matches the host star. One hemisphere has perpetual daylight while the other has only night. | |||
==[[Terrestrial Planet]]s== | ==[[Terrestrial Planet]]s== | ||