cosmic microwave background

noun

Examples of cosmic microwave background 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.
These pairs are expected to scatter off the cosmic microwave background and then to produce lower-energy gamma rays in the GeV range. Mrigakshi Dixit, Interesting Engineering, 4 Nov. 2025 There are some proposals to use loop quantum gravity to make sense of signatures in the cosmic microwave background radiation that’s left over from the Big Bang. Zack Savitsky, Quanta Magazine, 29 Oct. 2025 As a result, a Universe with dark matter has twice the number of fluctuation peaks-and-valleys in both the cosmic microwave background’s spectrum and also the power spectrum of large-scale structure than a Universe with normal matter alone. Big Think, 23 Oct. 2025 Astronomers combine these measurements with other dark energy and matter distribution studies, including the Dark Energy Survey (DES) measurements of distant supernovae and maps of the cosmic microwave background light left over from the dawn of the universe. Rebecca Boyle, Scientific American, 4 Oct. 2025 See All Example Sentences for cosmic microwave background

Word History

First Known Use

1981, in the meaning defined above

Time Traveler
The first known use of cosmic microwave background was in 1981

Browse Nearby Words

See all Nearby Words

Cite this Entry

“Cosmic microwave background.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmic%20microwave%20background. Accessed 13 Nov. 2025.

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!