expanding universe

American  

noun

Astronomy.

1. 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.

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Etymology

Origin of expanding universe

First recorded in 1930–35

Example Sentences

“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

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

From Science Daily

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

From Salon

In other words, we're trying to find out the speed limit of the expanding universe, but some measurements have given us different answers.

From Salon

As a crosscheck, an initial Webb observation in 2023 confirmed that Hubble measurements of the expanding universe were accurate.

From Science Daily