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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]].
===Beyond the Curriculum===
{{#ev:youtube|https://www.youtube.com/watch?v=fFeV8WxIZLk}}