expanding universe

noun

: a relativistic concept of the material universe according to which all celestial bodies are becoming steadily farther apart with the result that those more remote recede from the earth at greater speeds

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“Expanding universe.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/expanding%20universe. Accessed 6 Feb. 2023.

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