The mass of a galaxy's central black hole is related to the mass of the galactic bulge. This implies that ____

a. central black holes formed when the galaxy bulges formed
b. central black holes have grown during the galaxy's lifetime as the galactic bulge has grown
c. galactic bulges shrink over time as mass is consumed by the central black hole
d. central black holes cause the formation of galactic bulges
e. black holes are only present in spiral galaxies


a

Physics & Space Science

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