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Synonyms

expanding universe

American

noun

Astronomy.

a concept or representation of the universe, based on the observed redshifts of distant galaxies, in which the galaxies are assumed to be receding from each other at a speed proportional to their separation as a result of the expansion of the universe.

Etymology

Origin of expanding universe

First recorded in 1930–35

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“In the quickly expanding universe of cases involving sanctions for the misuse of artificial intelligence, this case is a notorious outlier in both degree and volume,” Clarke wrote.

From Los Angeles Times • Mar. 27, 2026

Radiation in the expanding universe gradually lost energy as its wavelengths stretched with spacetime.

From Science Daily • Dec. 7, 2025

Belgian cosmologist and Catholic priest Georges Lemaitre made that connection by realizing that the theory of general relativity described an expanding universe.

From Salon • Feb. 14, 2025

He said the company's order portfolio was strong and fully booked well into 2025, but the company wanted to test this expanding universe.

From Reuters • Oct. 14, 2023

In an expanding universe in which the density of matter varied slightly from place to place, gravity would have caused the denser regions to slow down their expansion and start contracting.

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023