If there is no dark matter in the Milky Way Galaxy,what is the best alternative explanation for the observations?
A)We are not measuring the orbital velocities of atomic clouds and stars properly.
B)We are not measuring the distances to atomic clouds and stars properly.
C)We are not attributing enough mass to the visible or "bright" matter.
D)We are not observing all the visible or "bright" matter in the galaxy.
E)Our understanding of gravity is not correct for galaxy-size scales.

Question

Quizplus · Accepted Answer

If dark matter does not exist, an alternative explanation is that our understanding of gravity might be incorrect on galaxy-size scales, which could account for the observed discrepancies in orbital velocities.

If There Is No Dark Matter in the Milky Way