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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > rich cluster

rich cluster
subject			fact

rich cluster	has number of galaxies > 100
	has diameter 1 Mpc
	has definition Galaxy cluster with 100 or more galaxies within a volume comparable to that of a loose group. Scale of cluster, about 1 Mpc.
	is a kind of galaxy cluster
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of rich cluster :

• Coma cluster (12 facts) (Coma X-1, Abell 1656) - The nearest massive cluster of galaxies. A symmetric cluster with primarily E and S0 galaxies. Luminous mass 4 × 10¹⁴ M_sun = 8 × 10⁴⁷ g; virial theorem mass about 5 × 10⁴⁸ g; mass needed to bind the cluster about 4 × 10⁴⁹ g. R ≈ 9 × 10²⁴ cm.
• Virgo cluster (7 facts) - An irregular cluster including the giant elliptical M87 (the galaxy of greatest known mass).

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