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SESK: Stuff Everyone Should Know · sesk.info/astro-galaxy-groups-gravity

How many galaxies does a galaxy group generally contain?

A galaxy group generally has 100 or fewer galaxies.

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  1. 100 or fewer ✔
  2. About 10,000
  3. More than one million

Why: Mutual gravity binds galaxies into groups. Groups are smaller than clusters and generally contain no more than about 100 galaxies.

Huh, didn't know that: With over 50 galaxies, our Local Group is a group, not a cluster.

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Galaxy groups stay together because gravity runs a tight meeting.
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References

Answer: 100 or fewer. Mutual gravity binds galaxies into groups. Groups are smaller than clusters and generally contain no more than about 100 galaxies.

  1. Large Scale Structures science.nasa.gov/universe/galaxies/large-scale-structures
    Galaxy groups generally hold 100 or fewer galaxies.
    Checked 2026-10-10.

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