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  1. Galaxy cluster - Wikipedia

    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 …

  2. Galaxy Clusters - Harvard–Smithsonian Center for Astrophysics

    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 …

  3. Large Scale Structures - NASA Science

    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 …

  4. Cluster of galaxies | Galactic Structure, Formation & Evolution ...

    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 …

  5. Galaxy Cluster: Definition, Names and Examples, Supercluster, Facts

    Dec 1, 2024 · Galaxy clusters are the largest known structures in the universe, held together by gravity. These groupings contain hundreds to thousands of galaxies spanning millions of light-years. Cluster …

  6. Galaxies in galaxy clusters Just as there are much more low-mass stars than massive stars, most galaxies in galaxy clusters are dwarf galaxies:

  7. Galaxy groups and clusters - Wikipedia

    Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. [2] They form the densest part of the large-scale structure …

  8. Chandra X-ray Observatory - Learn About Galaxy Clusters

    Galaxy clusters are the largest objects in the Universe held together by gravity. Chandra detects the superheated gas that fills the space between the hundreds and thousands of galaxies in these …

  9. Galaxy groups and clusters - New World Encyclopedia

    The smaller aggregates, typically containing less than 50 galaxies each, are referred to as galaxy groups, and the larger aggregates are known as galaxy clusters.

  10. NASA Webb ‘Pierces’ Bullet Cluster, Refines Its Mass

    Jun 30, 2025 · The Bullet Cluster is made up of two very massive collections of galaxies, known as galaxy clusters, that are themselves bound by gravity. These galaxy clusters act as gravitational …