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==Key Stage 3==
===Meaning===
[[File:Galaxy2Galaxy1.png|right|300px|thumb|This [[galaxy]] has over 100 billion [[star]]s.]]
A [[galaxy]] is a group of millions of [[Star|stars]] held together by [[Gravity|gravity]].
===About Galaxies===
: Our home [[galaxy]] is called [[The Milky Way]] which contains around 400 billion [[star]]s.
: The nearest [[galaxy]] to [[The Milky Way]] is called the [[Andromeda]] [[galaxy]] and is 2,000,000 [[Light Year]]s away.
: '''Galaxies''' are usually held together by a large [[Black Hole]] at the centre. The [[stars]] all [[orbit]] this central [[Black Hole]].
: [[Scientist]]s believe there are over 200 billion '''galaxies''' in the [[Universe]].
==Key Stage 4==
===Meaning===
[[File:Galaxy1.png|right|300px|thumb|This [[galaxy]] has over 100 billion [[star]]s.]]
A [[galaxy]] is a group of millions of [[Star|stars]] held together by [[Gravity|gravity]].
===About Galaxies===
: Our home [[galaxy]] is called [[The Milky Way]] which contains around 400 billion [[star]]s.
: The nearest [[galaxy]] to [[The Milky Way]] is called the [[Andromeda]] [[galaxy]] and is 2,000,000 [[Light Year]]s away.
: '''Galaxies''' are usually held together by a large [[Black Hole]] at the centre. The [[stars]] all [[orbit]] this central [[Black Hole]].
: [[Scientist]]s believe there are over 200 billion '''galaxies''' in the [[Universe]].
===References===
====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 ''Galaxies, page 250, GCSE Physics, Hodder, 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=f0dfb66dafcb0c6e9449e7b1a4ae1ac207 ''Galaxies, pages 101, 102, GCSE Physics; The Revision Guide, CGP, 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 ''Galaxies, pages 320, 322, 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 ''Galaxies; and red-shift, page 256, GCSE Physics, Hodder, 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 ''Galaxy, pages 274-5, 280, 289-293, GCSE Physics; Student Book, Collins, AQA '']
====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 ''Galaxies, speed of, pages 236-237, Gateway GCSE Physics, Oxford, OCR '']