- #1
Moose352
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My understanding is that dark matter surrounds a galaxy in a spherical formation. What I don't understand this type of dark matter can explain the non-Kepplerian rotation of the galaxy. According to Gauss's law, in a spherical shell, only the mass inside the orbit of a body has a net gravitational force on the body. Why then would the dark matter surrounding the galaxy have any gravitational effect on the anything inside of it?