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{{#ev:youtube|https://www.youtube.com/watch?v=nrTsvn9usVQ}}
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===References===
====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 ''The universe, pages 238-241, GCSE Physics; Third Edition, Oxford University Press, AQA '']