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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > rich cluster
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rich cluster comparison table
Subject has number of galaxie has member is part of has wavelength has redshift is an instance of has diameter has synonym has mass has definition has distance
Coma cluster1000 celestial sphereX-rayz = 0.023X-ray source10 million light yearsAbell 16564 × 1014 Msun (luminous matter)The nearest massive cluster of galaxies. A symmetric cluster with primarily E and S0 galaxies. Luminous mass 4 × 1014 Msun = 8 × 1047 g; virial theorem mass about 5 × 1048 g; mass needed to bind the cluster about 4 × 1049 g. R ≈ 9 × 1024 cm.300 million light years
Virgo cluster2500M87Local Supercluster z = 0.004rich cluster1 Mpc  An irregular cluster including the giant elliptical M87 (the galaxy of greatest known mass). 

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