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Employing Newton's stellar balance equation and using the flat rotationvelocity of satellite galaxies, we have found the velocity of sound in the darkmatter medium. What is interesting is that the velocity of satellite galaxiesis very much larger than the velocity of sound in the dark matter medium. Thisindicates that there will be shock wave in the dark matter medium due to thesupersonic movement of satellite galaxies.

A note on shock wave in the dark matter medium