Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.

Name: Some large clusters of galaxies do not appear to contain enough mass to hold themselves together.
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This statement is true. These galaxy clusters are known as "dark matter deficient" clusters, as they seem to have much less dark matter than expected based on observations of other similar clusters. This discrepancy is still not fully understood and is an area of active research in astrophysics.

Some Large Clusters of Galaxies Do Not Appear to Contain