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→Formation of Solar Systems
#Over millions of [[year]]s [[gravity]] causes the [[asteroid]]s collide to form bigger and bigger [[asteroid]]s until they are so large that they have enough [[gravity]] to pull their [[matter]] in to a [[sphere|spherical]] shape and become [[Dwarf Planet|dwarf planets]].
#Eventually the [[Dwarf Planet|dwarf planets]] may sweep enough [[material]] out of their [[orbit]]al path that they are considered [[planet]]s.
: The [[planet]]s closest to the [[star]] collect very little [[gas]] and become [[Rocky Planet|rocky planets]].
: The [[planet]]s furthest from the [[star]] collect a large amount of [[gas]] and become [[Gas Giant|gas giant]]s.