Light pollution and its causes
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Pictures from Galaxy Picture Library
All images are copyright – please do not copy them from here for any purpose without permission. 
LP-1868_fpo.jpg: a
LP-1868.jpg
Light pollution over Uxbridge, UK
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LP-6419.jpg
Light pollution over Uxbridge, UK
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LP-600.jpg
Taurus and Perseus with light pollution
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percomp.jpg
Pereus witn and without light pollution
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aurcomp.jpg
Auriga with and without light pollution
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5041lr.jpg
Fisheye view of sky showing light pollution and Milky Way, from St Lawrence, Essex
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584.jpg
Light pollution over Greater London
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2263.jpg
Orion and Canis Major from Tillingham, Essex, showing light pollution from N Kent coast
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Orion from suburbs with light pollution
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Star trails of Auriga from country area of Sussex, UK, with some light pollution
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europe_night.jpg
City lights of Europe
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flat_earth_night.jpg
Earth showing city lights
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LP-7521.jpg
Low-pressure sodium streetlight
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LP-608.jpg
Full cutoff low-pressure sodium streetlight
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lp1867sm.jpg
Full cutoff low-pressure sodium streetlights on A40 near Hillingdon, UK
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lp4779sm.jpg
Full cutoff low-pressure sodium streetlights on A40 near Hillingdon, UK
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LP-7474.jpg
Light-pollution-free fitting in Manchester, UK, directs light downward
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LP-7473.jpg
Light-pollution-free fittings in Manchester, UK, direct light downward
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LP-7188.jpg
Early simple light fitting with single incandescent bulb and reflectors
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LP-480a.jpg
Full cutoff light in antique-style lantern, Princes Risborough, Bucks, UK
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LP-7482.jpg
Globe-style light in Uxbridge, UK – more light goes up than down
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LP-1133.jpg
Full cutoff streetlights on M40 near High Wycombe, Bucks, UK
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LP-6210.jpg
Light pollution from floodlights in Denham, Bucks, UK
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LP-7504.jpg
Floodlit sports facility in High Wycombe, Bucks, UK, showing upward beams
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LP-7494.jpg
Glare from floodlit sports facility in High Wycombe, Bucks, UK
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LP-7508.jpg
Poorly designed floodlighting on church in Princes Risborough, Bucks, UK, with upward directed beams
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LP-7511.jpg
Trees floodlit by upward-pointing beams at Waddesden Manor, Bucks, UK (National Trust!)