dark matter

noun

: nonluminous matter not yet directly detected by astronomers that is hypothesized to exist to account for various observed gravitational effects

Examples of dark matter in a Sentence

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Their model posits that in a world where dark energy and dark matter interact, what seemed to be a crisis caused by disparate expansion rates instead becomes something to be expected. Quanta Magazine, 22 June 2026 Thus, dark matter annihilation is only a factor when this mysterious stuff is densely clustered in a region like the heart of a galaxy. Robert Lea, Space.com, 21 June 2026 These processes will aim to provide valuable information and imagery to scientists, who may then decipher truths surrounding dark matter, dark energy and the expansion of the universe. Eleanor Jacobs, PEOPLE, 21 June 2026 Could this glow be evidence of dark matter? Possibly. Christopher Karwin, The Conversation, 8 June 2026 See All Example Sentences for dark matter

Word History

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of dark matter was in 1933

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Cite this Entry

“Dark matter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dark%20matter. Accessed 25 Jun. 2026.

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