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.


b

Physics & Space Science

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