Suppose the X-ray signal from a quasar fluctuates with a period of 3 hours. What is the maximum size of the source?
A) 150,000 km, about the diameter of Jupiter
B) 10.8 au, about the diameter of Jupiter's orbit
C) 4.5 ly, about the distance between the Sun and the nearest star
D) 10,800 ly, a tenth the size of the Milky Way Galaxy
Correct Answer:
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