How the Edge of Our Galaxy Defies Known Physics

Gravity ? In space lol . No gravity is the electromagnetic effect from objects the bigger the object the more the electromagnetic  pull.  All matter is atomic all atoms are electricity . You cannot use earth bound physics in space . Maybe dark matter is just that ? What we cannot see meaning the rest of the spectrum beyond the visible spectrum so have you looked to see if gamma x Ray's and all the other light spectrum is in and around the galaxy . I'm sure you'll find they are .