SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/astro-galaxy-cluster-members

Roughly how many galaxies can a galaxy cluster contain?

A cluster can contain hundreds to thousands of galaxies.

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  1. Fewer than ten
  2. Hundreds to thousands ✔
  3. Exactly one billion

Why: Galaxy clusters are larger bound systems than galaxy groups. Their mass also includes very hot gas and abundant dark matter.

Huh, didn't know that: The Coma Cluster contains more than 1,000 identified galaxies.

The dad joke
A galaxy cluster is what happens when gravity overbooks the venue.
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References

Answer: Hundreds to thousands. Galaxy clusters are larger bound systems than galaxy groups. Their mass also includes very hot gas and abundant dark matter.

  1. Large Scale Structures science.nasa.gov/universe/galaxies/large-scale-structures
    Galaxy clusters contain many more galaxies, from hundreds to thousands.
    Checked 2026-10-10.

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