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==Key Stage 3==
===Meaning===
An [[Orbit]] is the path an [[asteroid]], [[comet]], [[planet]] or [[Dwarf Planet|dwarf planet]] takes around a [[star]] and the path a [[moon]] takes around a [[planet]].
===About Orbits===
: [[Moon]]s [[orbit]] [[planet]]s and [[planet]]s [[orbit]] the [[stars]] due to [[gravity]].
: [[Isaac Newton|Newton]] was the first person to realise that [[object]]s were held in [[orbit]] by [[gravity]] which he [[explain]]ed in his [[Newton's Law of Universal Theory of Gravitation|Law of Universal Theory of Gravitation]].
: [[Gravity]] is a constant [[force]] directed to the centre of a [[massive]] [[object]].
: [[The Moon]] feels a [[force]] pulling it towards the centre of the [[Earth]]. The [[Earth]] feels a [[force]] equal in [[magnitude]] but opposite in direction to that of [[The Moon]].
''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.
{| class="wikitable"
|[[File:CircularMotion.gif|center|]]
|-
| style="height:20px; width:200px; text-align:center;" |This animation shows [[acceleration]] due to the changing direction of a circular [[orbit]] of the blue [[object]] around the red [[object]]. A circular [[orbit]] is one of constant [[radius]].
|}
|[[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.
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Orbit, pages 276, 278-9, GCSE Physics; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac350 ''Orbits, page 101, GCSE Physics; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Orbits, pages 236-237, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Orbits, pages 249-50, GCSE Physics, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Orbits, pages 320, 321, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Orbits; circular, pages 253-5, GCSE Physics, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Orbits; speed of, pages 254-5, GCSE Physics, Hodder, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Orbits, page 59, GCSE Physics; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Orbits, pages 118, 120-121, GCSE Physics, Pearson Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Orbits, pages 184-186, GCSE Physics, CGP, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Orbits, page 97, Gateway GCSE Physics; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Orbits, pages 240-241, Gateway GCSE Physics, Oxford, OCR '']