We derive the cosmic energy equation for extended mass structures (i.e., galaxies with halos) which cluster gravitationally in the expanding universe. From this cosmic energy equation, we study the quasi-static evolution for nonpoint mass system of galaxies. Using this cosmic energy equation, we examine the growth of correlation potential energy for the extended masses. We also derive the expression for virial mass and try to account for the dark matter present in the halos of the galaxies.

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