Astronomers speculate that most galaxies have a massive black hole at their center. What could be the origin of the suspected black hole?
A. The gravitational attraction drew in stars from the disk.
B. the collision of galaxies
C. the rapid rotation of the galaxy that compressed material to high densities
D. dark matter at the galactic center
E. First, a supernova explosion formed a black hole, which in time became more massive by accretion.
Answer: E
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