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It is an increase in the apparent brightness of the night sky that can serve to reduce visibility for astronomical observation. Sky glow occurs when artificial light which shines upwards, reflects off clouds and atmospheric particles such as dust and water, causing a ‘scattering’ effect. It can be caused by any artificial lighting such as street lamps, flood lights, security lighting, illuminated buildings, lights left on in office buildings at night, airport landing lights and so on. Recently, a new study has found that non-natural light had increased the brightness of Skyglow, by 9.2-10% every year between 2011 and 2022 with significant ecological, health and cultural implications.
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