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→Key Stage 4
: [[Orbit]]s are caused by a [[force]] of attraction between two [[object]]s acting towards their centres.
: [[Planet]]s [[orbit]] [[Star]]s due to the [[force]] of [[gravity]].
''Higher''
: There are two types of [[orbit]] you should know:
:*Circular [[orbit]] - An [[orbit]] where the distance between the two [[object]]s (the [[radius]]) remains constant. In this [[orbit]] the [[speed]] of the [[orbit]]ting [[object]] is constant. However, the [[velocity]] of the [[orbit]]ting [[object]] is constantly changing due to the changing direction.
|[[File:Orbit1.gif|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |This [[animation]] shows the elliptical [[orbit]] of a [[planet]] around a [[Star]]. As the [[planet]] gets further from the [[Star]] the [[speed]] of the [[planet]] decreases. As the [[planet]] gets closer to the [[Star]] the [[speed]] of the [[planet]] increases.
|}