Most of the mass of the Milky Way seems to exist in the form of:
A)Population I stars in the disk.
B)Population II stars in the halo.
C)hydrogen gas in the disk and spiral arms.
D)dark matter out in the halo.
E)the black hole in the Galactic Center.

Question

Quizplus · Accepted Answer

Observations of the motions of stars and gas in the Milky Way suggest the existence of a large amount of dark matter in the halo, which cannot be accounted for by visible matter. Therefore, most of the mass of the Milky Way is believed to exist in the form of dark matter. Observations and simulations suggest that a large amount of dark matter exists in the halo of the Milky Way and makes up most of its mass.

Most of the Mass of the Milky Way Seems to Exist