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: After a [[High Mass Star|high mass star]] has gone [[supernova]] the core which remains is crushed so much that the [[atom]]s [[Nuclear Fusion|fuse]] together and all [[proton]]s turn into [[neutron]]s making one single [[atom]] made of [[neutron]]s.
: A '''neutron star''' is around 20km in [[diameter]].
===References===
:[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 ''Neutron stars, page 319, 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 ''Neutron stars, pages 252, 253, 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 ''Neutron stars, page 123, 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 ''Neutron stars, page 188, GCSE Physics, CGP, Edexcel '']
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=fFeV8WxIZLk}}
{{#ev:youtube|https://www.youtube.com/watch?v=ZW3aV7U-aik}}