The best evidence for the existence of supermassive black holes is
A)very high orbital velocities in a very compact region.
B)evidence for jet velocities that approach the speed of light.
C)large quantities of high-energy emission such as X-rays and gamma rays,and radio emission from relativistic electrons.
D)huge dark regions in the centers of galaxies,where black holes have been sucking in the galaxy from the inside out.

Question

Quizplus · Accepted Answer

The very high orbital velocities in a very compact region indicate the presence of a massive object with a strong gravitational pull, consistent with a supermassive black hole.

The Best Evidence for the Existence of Supermassive Black Holes