Changes

===HistoryAbout Solar Systems===: There are many [[Solar System]]s in our [[galaxy]].: Some [[Solar System]]s have more than one [[Star]]. ==Key Stage 3==Geocentric Model===Meaning===A [[Solar System]] is a group of [[planet]]s [[orbit]]ting a [[star]]. ===About Solar Systems=Heliocentric Model==: There are many [[Solar System]]s in our [[galaxy]].: Some [[Solar System]]s have more than one [[Star]]. ==Key Stage 4=====Meaning===A [[Solar System]] is a group of [[planet]]s [[orbit]]ting a [[star]]. ===About Solar Systems===: There are many [[Solar System]]s in our [[galaxy]].: Some [[Solar System]]s have more than one [[Star]].: The [[planet]]s around a [[star]] which is not the [[Sun]] are called [[exoplanet]]s.