Which of the following is the best description of the rotation curve of the galaxy between the Sun's orbital distance and twice the Sun's orbital distance?

Question

Quizplus · Accepted Answer

The rotation curve of the galaxy between the Sun's orbital distance and twice the Sun's orbital distance is flat, meaning the orbital speed of stars does not change significantly with distance from the galactic center. This is one of the pieces of evidence for the existence of dark matter, which is thought to be responsible for the flatness of the rotation curve.

Which of the Following Is the Best Description of the Rotation