What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A)We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.
B)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.
C)The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole.
D)Huge amounts of X- rays are pouring out of the center of the galaxy.

Question

Quizplus · Accepted Answer

The orbits of stars in the center of the galaxy indicate the presence of a huge object with a mass of about 3 to 4 million Suns that is concentrated in a very small region. This is best explained by the presence of an extremely massive black hole. Options A and D are also indicative of the presence of a black hole, but option B provides more direct and robust evidence. Option C is incorrect, as pulsars are not necessarily black holes - they could also be rapidly rotating neutron stars.

What Is the Best Evidence for an Extremely Massive Black