Question
A group of seven galaxies each of a total mass 1 0 1 2 M form a stable cluster in a sphere of constant radius
A group of seven galaxies each of a total mass M form a stable cluster in a sphere of constant radius Mpc At what redshift did this group have the same mean density as the surrounding Universe? You may assume that the Universe is flat with Mand that the Hubble constant is Hkm sMpc
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Elementary Statistics
Authors: Mario F. Triola
3rd Canadian Edition
032122597X, 978-0321225979
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