Planets

Planets

Definition: The definition of a planet as defined by the international astronomical union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its region of planitesimals.

Types of planets: There are two types of planets, gaseous and terrestrial: Gaseous- Gaseous planets are completely made up of gas exept for a small are of terrain no bigger than the Earths moon. E.g. Saturn Terrestrial- Terrestrial planets are very much the opposite to gaseous planets, the whole planet is a solid serface exept for a thin layer of atmosphere where gases are. E.g. Earth is a terrestrial planet