cosmic dust

noun

: very fine particles of solid matter found in any part of the universe

Examples of cosmic dust in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
One standout example comes from Ronald Brecher, who spent a grand total of 38 hours imaging Andromeda in August and September earlier this year to reveal a wealth of star formation brightening spiral arms choked with cosmic dust. Anthony Wood, Space.com, 15 Oct. 2025 The other 80 percent, meanwhile, are simply pulverized and ground into cosmic dust within the asteroid belt. Chris Young, Interesting Engineering, 3 Oct. 2025 In this way, cosmic dust behaves as a very efficient absorber of visible light, is only lightly absorbed by near-infrared light, and is practically perfectly transparent to mid-infrared (and longer) wavelengths of light. Ethan Siegel, Big Think, 12 Sep. 2025 Most cosmic dust exhibits random atomic structures, and appears like soot. Andrew Paul, Popular Science, 27 Aug. 2025 See All Example Sentences for cosmic dust

Word History

First Known Use

1881, in the meaning defined above

Time Traveler
The first known use of cosmic dust was in 1881

Cite this Entry

“Cosmic dust.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmic%20dust. Accessed 29 Oct. 2025.

Kids Definition

cosmic dust

noun
: very fine particles of solid matter found in any part of the universe
Last Updated: - Updated example sentences
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