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

Recent Examples on the Web
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This means that, today, dark energy dominates the Universe, while dark matter and normal matter play a sub-dominant role. Ethan Siegel, Big Think, 3 Oct. 2025 Its decay produces flashes of light in the detector that can mimic potential dark matter signals. Kapil Kajal, Interesting Engineering, 2 Oct. 2025 Both projects were organized to determine if the 68 percent of all mass and energy, collectively termed dark matter, originates from a pure cosmological constant. Andrew Paul, Popular Science, 1 Oct. 2025 The glowing road between peaks shows the partnerships between facilities who work together to advance astronomy by looking at things from near-Earth objects to distant galaxies to dark matter. Kenna Hughes-Castleberry, Space.com, 30 Sep. 2025 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 6 Oct. 2025.

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