Jisho

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ぎんがだん 銀河団
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Noun
1. cluster of galaxies​Astronomy
Wikipedia definition
2. Galaxy groups and clusters​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.
Read “Galaxy groups and clusters” on English Wikipedia
Read “銀河団” on Japanese Wikipedia
Read “Galaxy groups and clusters” on DBpedia

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