Redshifts revealed the radio source Cygnus A to be moving at 17,000 km/s. At this speed it could not have been a part of the Milky Way Galaxy. At this speed how long would it have taken to cross the whole of the visible Galaxy?
A) a few years
B) a few million years
C) a few hundred million years
D) 10 billion years, almost the age of the Galaxy
Correct Answer:
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