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contain 100 to 1,000 galaxies, hot X-ray emitting gas and large amounts of dark matter. Details are described in the "Composition" section.
* They have total masses of 10¹⁴ to 10¹⁵ solar masses.
* They typically have diameters from 1 to 5 Mpc (see 10²³ m for distance comparisons).
* The spread of velocities for the individual

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