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Light pollution refers to the excessive or obtrusive artificial light that is introduced into the night sky, disrupting natural light patterns and obscuring celestial objects. This can include glare, skyglow, light trespass, and clutter. Light pollution can have negative impacts on the environment, human health, and the ability to observe the stars and other astronomical phenomena. It is often caused by poorly designed or excessive outdoor lighting in urban areas, resulting in a loss of visibility and increased energy consumption.