dark matter

noun

Definition of dark matter

: 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 Ever since the discovery in the 1990s that neutrinos have mass, theorists have wondered if neutrinos could account for the enormous amount of dark matter that seems to engulf galaxies. Quanta Magazine, 28 Oct. 2021 The article notes that dark matter is driving the accelerated expansion of the universe and that galaxies that are farther away reflect earlier cosmic eras. Scientific American, 16 Aug. 2021 Cosmologists estimate that dark matter makes up about 24 percent of all the stuff in the universe. Priyamvada Natarajan, The New York Review of Books, 15 June 2021 Visible matter makes up about 5% of the universe, while dark matter makes up about 20%. John Mccormick, WSJ, 4 June 2021 At the time that dark matter got its name, there were almost no Black men and literally zero Black women with a doctorate in physics. Lisa Selin Davis, CNN, 2 May 2021 The rest of the Universe must be some form of energy that has, thus far, evaded direct detection, with 68% being dark energy and 27% dark matter. Ethan Siegel, Forbes, 2 Sep. 2021 The cluster, which is called MACS J0138.0-2155, is full of dark matter. Elizabeth Howell, Forbes, 21 Sep. 2021 The cost of establishing a network of suitable telescopes is lower than the amount invested so far in the search for the nature of dark matter. Avi Loeb, Scientific American, 2 Aug. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dark matter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of dark matter

1979, in the meaning defined above

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Time Traveler for dark matter

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The first known use of dark matter was in 1979

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dark matter

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Statistics for dark matter

Last Updated

15 Nov 2021

Cite this Entry

“Dark matter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dark%20matter. Accessed 8 Dec. 2021.

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More from Merriam-Webster on dark matter

Britannica.com: Encyclopedia article about dark matter

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