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==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=V_A78zDBwYE}}
===References===
====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 ''Light pollution, page 190, GCSE Physics, CGP, Edexcel '']