1) Galaxy cluster 
(from the article `Cosmos`) The nearest rich cluster containing thousands of systems, the Coma cluster, lies about seven times farther than the Virgo cluster in the direction of ...
The nearest massive cluster of galaxies, also known as Abell 1656; it is roughly spherical, about 20 million light-years in diameter, contains more than 3,000 galaxies, and lies about 280 million light-years away in the constellation Coma Berenices. Its location close to the north galactic pole make...