High Quality Content by WIKIPEDIA articles! Galaxy groups and
clusters are the largest known gravitationally bound objects to
have arisen thus far in the process of cosmic structure formation.
They form the densest part of the large scale structure of the
universe. In models for the gravitational formation of structure
with cold dark matter, the smallest structures collapse first and
eventually build the largest structures, clusters of galaxies.
Clusters are then formed relatively recently between 10 billion
years ago and now. Groups and clusters may contain from ten to
thousands of galaxies. The clusters themselves are often associated
with larger groups called superclusters.
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