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SESK: Stuff Everyone Should Know · sesk.info/astro-superclusters-not-bound

Are superclusters usually gravitationally bound as single systems?

No. Superclusters are typically not gravitationally bound.

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  1. Yes, always
  2. Only by magnetic fields
  3. No, typically not ✔

Why: Superclusters collect groups, clusters, and individual galaxies on enormous scales. Cosmic expansion means the whole supercluster usually is not one bound object.

Huh, didn't know that: The Local Group sits on the outer edges of the Laniakea supercluster.

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Superclusters keep things loose because commitment on that scale is hard.
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References

Answer: No, typically not. Superclusters collect groups, clusters, and individual galaxies on enormous scales. Cosmic expansion means the whole supercluster usually is not one bound object.

  1. Large Scale Structures science.nasa.gov/universe/galaxies/large-scale-structures
    Superclusters are large collections of galaxy clusters, groups, and individual galaxies that are typically not gravitationally bound to each other.
    Checked 2026-10-10.

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