A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, [1] with typical masses ranging from 10 14 to 10 15 solar masses.

This article lists some galaxy groups and galaxy clusters. Defining the limits of galaxy clusters is imprecise as many clusters are still forming. In particular, clusters close to the Milky Way tend to be classified as galaxy clusters even when they are much smaller than more distant clusters.

Clusters of galaxies are the most recent and most massive objects to have arisen in the hierarchical structure formation of the Universe and the study of clusters tells one about the way galaxies form and evolve.

Galaxy clusters are the largest objects in the universe that are held together by their own gravity. They contain hundreds or thousands of galaxies, lots of hot plasma, and a large amount of invisible dark matter.

Oct 22, 2024 · Galaxy clusters contain many more galaxies, from hundreds to thousands. The Coma cluster, for example, houses over 1,000 individual galaxies and stretches over 20 million light-years across.

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1 day ago · Deep in the heart of the Milky Way, hidden behind thick clouds of cosmic dust, lies one of the most mysterious and massive star clusters ever discovered—Westerlund 1.This super star cluster is a powerhouse of stellar activity, home to some of the biggest and brightest stars in our galaxy. And now, thanks to the Hubble Space Telescope (HST), we are getting our most detailed look yet at this ...

May 3, 2016 · Explore how individual galaxies assemble into colossal cosmic communities. The first galaxies emerged a couple hundred million years after the Big Bang. Over time, individual galaxies assembled into sizable groups, which scientists refer to as galaxy clusters.

Aug 14, 2023 · Observing galaxy clusters like Abell 3322 can advance our understanding of the evolution and interactions of dark and luminous matter in galaxy clusters, and also reveals powerful gravitational ‘telescopes’ that magnify distant objects through gravitational lensing.

Cluster of galaxies, Gravitationally bound grouping of galaxies, numbering from the hundreds to the tens of thousands. Large clusters of galaxies often exhibit extensive X-ray emission from intergalactic gas heated to tens of millions of degrees.