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.
The fluctuations in the cosmic microwave background tell us how close-to-perfectly uniform the Universe was at the start of the Big Bang. Ethan Siegel, Big Think, 11 Sep. 2025 Completed in 2007, the 33-ft (10 meters) radio telescope was designed to study faint microwave signals from the early universe, including the cosmic microwave background, the afterglow of the Big Bang. Kenna Hughes-Castleberry, Space.com, 8 Sep. 2025 The Dark Energy Spectroscopic Instrument surveys dark energy of the Universe to complement the understanding of the cosmic microwave background. Madison Dapcevich, Discover Magazine, 18 July 2025 The tiny variations in the cosmic microwave background tell us about the influence of both matter that interacts with light and matter that doesn’t. ArsTechnica, 25 June 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 18 Sep. 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!