cosmic microwave background

noun

Examples of cosmic microwave background in a Sentence

Recent Examples on the Web
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With many different exquisite cosmology data sets, from the cosmic microwave background to the large-scale structure of the Universe to ultra-distant supernovae, the Universe doesn’t quite add up. Ethan Siegel, Big Think, 2 Sep. 2025 The cosmic microwave background, released 380,000 years later, contains a faint memory of that initial imprint, as seen in variations in temperature across the sky. Paul Sutter, Space.com, 28 Aug. 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

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Cite this Entry

“Cosmic microwave background.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cosmic%20microwave%20background. Accessed 9 Sep. 2025.

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