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microwave background

British  

noun

  1. a background of microwave electromagnetic radiation with a black-body spectrum discovered in 1965, understood to be the thermal remnant of the big bang with which the universe began

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

microwave background Scientific  

Example Sentences

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To investigate which explanation better fits the evidence, the researchers analyzed ACT observations of the cosmic microwave background, or CMB.

From Science Daily Aug. 25, 2026

Scientists could also search the cosmic microwave background for subtle patterns that might preserve information from a time before the Big Bang.

From Science Daily Aug. 11, 2026

Arno Penzias at Bell Labs won the Nobel Prize in Physics for discovering “cosmic microwave background radiation” from the Big Bang.

From The Wall Street Journal Mar. 29, 2026

They’ve measured the cosmic microwave background, or leftover radiation from the Big Bang, with extremely high precision to help paint a picture of the first nanoseconds of the universe.

From Salon Jan. 17, 2025

Observations of the microwave background and of the abundances of the light elements indicate that the early universe did not have the kind of curvature required to allow time travel.

From "A Brief History of Time: And Other Essays" by Stephen Hawking

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