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===About Solar Systems===
: There are many [[Solar System]]s in our [[galaxy]] but our [[Solar System]] is called [[The Solar System]].
: Some [[Solar System]]s have more than one [[Star]].
===About Solar Systems===
: There are many [[Solar System]]s in our [[galaxy]] but our [[Solar System]] is called [[The Solar System]].
: Some [[Solar System]]s have more than one [[Star]].
===About Solar Systems===
: There are many [[Solar System]]s in our [[galaxy]] but our [[Solar System]] is called [[The Solar System]].
: Some [[Solar System]]s have more than one [[Star]].
: The [[planet]]s around a [[star]] which is not the [[Sun]] are called [[exoplanet]]s.
===Formation of Solar Systems===
#A large cloud of [[gas]]] and dust called a [[nebula]] collapses due to [[gravity]] to form a [[protostar]].
#Some of the leftover [[gas]] and dust forms a spinning disk held in [[orbit]] around the newly formed [[star]] by [[gravity]].
#The [[star]]s [[radiation]] causes the [[gas]] to spread further away from the centre of the disk leaving behind the dust.
#[[Gravity]] between the [[particle]]s of dust causes them to clump together to form [[asteroid]]s.
#Over millions of [[year]]s [[gravity]] causes the [[asteroid]]s to 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.
===References===
====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=f0dfb66dafcb0c6e9449e7b1a4ae1ac412 ''Solar system, page 101, GCSE Physics; The Revision Guide, 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 ''Solar system, page 249, 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 ''Solar system, page 320, GCSE Physics; The Complete 9-1 Course for AQA, 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 ''Solar system, pages 232-233, 235, GCSE Physics; Third Edition, Oxford University Press, 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 ''Solar system, pages 275-8, 292, GCSE Physics; Student Book, Collins, 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 ''Solar system; early ideas of, pages 258-9, GCSE Physics, Hodder, AQA '']
====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 ''Solar system, pages 118-119, 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 ''Solar system, pages 183-185, GCSE Physics, CGP, 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 ''Solar system, pages 59, 60, GCSE Physics; The Revision Guide, 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 ''Solar system, 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 ''Solar system, pages 238-239, Gateway GCSE Physics, Oxford, OCR '']