The broadening of spectral lines due to the collective Doppler shifts of objects orbiting the center of the Milky Way Galaxy suggests that the mass at the center of the Galaxy is about 4 million solar masses.What is believed to be the diameter of this supermassive object?
A) about half a parsec
B) about 8 ly
C) about the diameter of the solar system
D) smaller than the diameter of the Sun
Correct Answer:
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