What is the best evidence for a supermassive black hole in the center of the Milky Way Galaxy?
A) Amazing filaments of radio emission swirling around the center of the galaxy
B) The existence of the Milky Way itself: the mass of the black hole is essential to gravitationally bind the galaxy together, so it doesn't fly apart.
C) The gigantic bursts of X-ray energy from a mysterious dark object
D) The motions of stars around a mysterious dark object

Question

Quizplus · Accepted Answer

The best evidence for a supermassive black hole in the center of the Milky Way is the observed motions of stars around a mysterious dark object. These stars orbit a central point with such high speeds that they must be influenced by an incredibly massive gravitational force, which can only be explained by the presence of a supermassive black hole.

What Is the Best Evidence for a Supermassive Black Hole