Supermassive black holes are believed to be located at the center of many galaxies because
A)the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter.
B)the orbital motion of material near the center is very fast and indicates a very massive core.
C)the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole.
D)the spiral structure requires a black hole to maintain the spiral arms.
E)the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.

Question

Quizplus · Accepted Answer

The orbital motion of material near the center being very fast indicates that there is a very massive object at the center of the galaxy, and a supermassive black hole is the most likely candidate for this object.

Supermassive Black Holes Are Believed to Be Located at the Center