PlanetsÂ are aÂ celestial bodies orbitingÂ aÂ starÂ .Â In 2006, theÂ International Astronomical UnionÂ officially adopted a resolutionÂ defining planetsÂ within theÂ Solar System. This definition has been both praised and criticized, and remains disputed by some scientists.Some of the planets are part of theÂ Solar SystemÂ which consists of theÂ SunÂ and theÂ astronomical objectsÂ gravitationallyÂ bound inÂ orbitÂ around it.Â The four smaller inner planets,Â Mercury,Â Venus,Â EarthÂ andÂ Mars, also called theÂ terrestrial planets.Â The two largest,Â JupiterÂ andSaturn, are composed mainly of hydrogen and helium; the two outermost planets,Â UranusÂ andÂ Neptune.
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