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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.

By examining galaxies in such detail, researchers can better understand how travel through a galaxy cluster influences star formation and drives long-term evolutionary changes.

From Science Daily • Jun. 1, 2026

To make the discovery, the researchers looked back roughly 12 billion years to study a young galaxy cluster known as SPT2349-56.

From Science Daily • Jan. 7, 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

These include the most distant galaxy cluster; it includes classes of objects like what we call JuMBOs, which stands for "Jupiter Mass Binary Objects."

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

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