light pollution

noun

: artificial skylight (as from city lights) that interferes especially with astronomical observations

Examples of light pollution in a Sentence

Recent Examples on the Web
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Some astronomers say Reflect Orbital’s light pollution would qualify as such. Mary Randolph, Scientific American, 16 July 2026 Later that night, with minimal light pollution and broad sea horizons, the islands are an exceptional place to watch the Perseid meteor shower beneath pristine late-summer skies. Jamie Carter, Space.com, 15 July 2026 There’s light pollution — and then there are giant orbital space mirrors that blot out the night sky. Frank Landymore, Futurism, 15 July 2026 Finally, light pollution is already interfering with astronomical observations—a problem made even worse by satellite constellations like SpaceX’s 10,000-strong Starlink fleet. Jeffrey Kluger, Time, 14 July 2026 See All Example Sentences for light pollution

Word History

First Known Use

1969, in the meaning defined above

Time Traveler
The first known use of light pollution was in 1969

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Cite this Entry

“Light pollution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/light%20pollution. Accessed 19 Jul. 2026.

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