Question

what observed property of the milky way suggests that it must contain a large amount of matter not in the form of stars, gas, or dust?

Answer 1

Step-by-step explanation:

The rotation curve of the Milky Way suggests that it contains a large amount of dark matter. This is because the rotation speeds of stars and gas on the outer edges of the Milky Way do not decrease as quickly as expected from the amount of visible matter, indicating that there must be an additional source of gravity from unseen matter.