What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The orbits of stars in the center of the galaxy indicate that the presence of 3 to 4 million solar mass object in a region no larger than our Solar System.
B) Huge amounts of X-rays are pouring out of the center of the galaxy.
C) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole.
D) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.

Question

Quizplus · Accepted Answer

The orbits of stars in the center of the galaxy can be measured and used to calculate the mass of the central object. These measurements have shown that there is a mass of 3 to 4 million solar masses in a region no larger than our Solar System, which is best explained by the presence of an extremely massive black hole. The other options may provide supporting evidence, but the most direct evidence comes from the stellar orbits.

What Is the Best Evidence for an Extremely Massive Black