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galaxy cluster

American  
[gal-uhk-see kluhs-ter] / ˈgæl ək si ˈklʌs tər /

noun

  1. Astronomy. an enormous grouping of hundreds or thousands of galaxies held together by shared gravity. Compare supercluster and open cluster.

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.

Newly reactivated jets from the black hole are pushing outward, only to be distorted and compressed by the intense pressure of the massive galaxy cluster surrounding it.

From Science Daily • Apr. 13, 2026

What you see here is an actively merging galaxy cluster, Abell 3667, located 700 million light-years away.

From Space Scoop • Sep. 19, 2025

I love a deep field image that shows the most distant galaxy cluster we've ever seen.

From Salon • Oct. 8, 2024

“Dazzling,” said the space agency’s science director, Carole Mundell, as she showed off the galaxy cluster shot on a large screen at the control center in Germany.

From Seattle Times • Nov. 7, 2023

Despite Abell 3827’s vast potential, for astronomers seeking to clarify its hidden workings, the galaxy cluster remains a muddled mess.

From Scientific American • Oct. 11, 2023

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.