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'''Light pollution''' is a man-made phenomenon whereby a detailed view of the night sky is obscured by excessive or poorly-designed artificial lighting, especially in or around cities and towns. This is a significant concern for amateur and professional astronomers, since it the vast majority of stars and astronomical features which would otherwise be visible from the earth's surface are hidden from view, or visible but at decreased resolution, within many miles of a developed population centre.

'''Light pollution''' is a man-made phenomenon whereby a detailed view of the night sky is obscured by excessive or poorly-designed artificial lighting, especially in or around cities and towns. This is a significant concern for amateur and professional astronomers, since the vast majority of stars and astronomical features which would otherwise be visible from the earth's surface are hidden from view, or visible but at decreased resolution, within many miles of a developed population centre.