What evidence now exists for a supermassive black hole at the center of our Galaxy?
A) A very dark void in an otherwise bright region of space near the galactic center,indicating the presence of a black hole
B) Observations of intense inflow of matter toward the center of the Galaxy,as seen by light-Doppler-shifted toward the red-emitted by this matter
C) An absence of gas clouds surrounding the region of space near the galactic center
D) Very rapid motion of matter close to the nucleus of the Galaxy,requiring a very massive body to hold it in orbit

Question

Quizplus · Accepted Answer

The very rapid motion of matter close to the nucleus of the Galaxy, requiring a very massive body to hold it in orbit, is the strongest evidence for the existence of a supermassive black hole at the center of our Galaxy. This motion has been observed in stars orbiting around the central region, which allowed scientists to estimate the mass of the central object to be millions of times the mass of the Sun.

What Evidence Now Exists for a Supermassive Black Hole at the Center