Most of the dark matter in the Milky Way galaxy is Question 17 options: a) non-accreting black holes located in the halo. b) old, lone, non-rotating neutron stars located in the halo. c) cold gas and dust located in the halo. d) old, cold, lone white dwarfs located in the halo. e) None of the above, those things listed above may be a small part of it but we don't know what most of the dark matter is