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
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Interstellar space contains a sparse smattering of hydrogen atoms and microscopic grains of cosmic dust. Kai James, The Conversation, 26 May 2026 What to read next The findings also show that water ice is not evenly distributed but instead concentrates in the densest regions of cosmic dust, which act as protective shields and block harsh ultraviolet radiation from nearby newborn stars and allow those fragile molecules to survive across eons. Sharmila Kuthunur, Space.com, 23 Apr. 2026 The team says its synthetic universe is the first large volume simulation to model cold gases and cosmic dust inside galaxies, the free-floating material that coalesces to form stars. Frank Landymore, Futurism, 23 Apr. 2026 Building up a database To make the cosmic dust, Losurdo started with nitrogen, carbon dioxide and acetylene — a colorless, odorless gas made up of carbon and hydrogen. Jacopo Prisco, CNN Money, 6 Feb. 2026 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 3 Jun. 2026.

Kids Definition

cosmic dust

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