The rapid rotation of the outer disk suggests that our galaxy is more massive than previously thought.

Question

Quizplus · Accepted Answer

The faster rotation of the outer disk indicates that there must be more mass in the galaxy to keep the outer stars in their orbits. This suggests that our galaxy is more massive than previous estimates, with some studies suggesting that the total mass may be up to three times higher than previously thought.

The Rapid Rotation of the Outer Disk Suggests That Our