dark matter


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

For instance, dark matter tends to form filaments, and the filaments' gravitational effects work like invisible highways in space, channeling matter in a particular direction. Kiona N. Smith, Ars Technica, "New observations of galaxies challenge the standard cosmological model," 1 Feb. 2018 The identity of dark matter and dark energy involve fundamental questions about how the Universe is constructed. John Timmer, Ars Technica, "We’ve seen more fast radio bursts, but we still don’t know what they are," 11 Oct. 2018 And dark matter and dark energy are key features of the standard model. Mike Wall, Space.com, "Observations of the Early Universe Reaffirm the Existence of Dark Matter and Dark Energy," 18 July 2018 Axions, a kind of particle that is a plausible candidate to provide the dark matter of the universe, might be discovered in this way. Frank Wilczek, WSJ, "Black Holes May Have ‘Hair’ That We Can See," 3 Jan. 2019 This team is not the first to propose looking for dark matter signatures in the Universe. Chris Lee, Ars Technica, "Pulsars could convert dark matter into something we could see," 20 Dec. 2018 These remnants would help bridge incompatible theories of the cosmos at its largest and smallest scales, as well as possibly constitute a sizable portion of the presently unaccounted-for dark matter. Adam Hadhazy, Discover Magazine, "Scientists Hunt for A Seeming Paradox: A Magnet With Only One Pole," 13 Nov. 2018 Still without stars or galaxies, the universe was filled with hydrogen gas and dark matter. Jay Bennett, Popular Mechanics, "Some of the Oldest Galaxies in the Universe Orbit the MIlky Way," 16 Aug. 2018 These particles might also be key to unlocking new physics, such as discovering the identity of dark matter. Avery Thompson, Popular Mechanics, "China Plans to Build a Particle Collider Five Times More Powerful Than the LHC," 14 Nov. 2018

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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Last Updated

26 Feb 2019

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The first known use of dark matter was in 1979

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having no equal

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