Observers in a Distant Solar System Are Watching Our Sun

Observers in a distant solar system are watching our Sun and using the radial-velocity method to try to determine whether the Sun has planets.Because of the gravitational pull of Jupiter,the observers see the Sun's spectrum slowly redshift and then blueshift by a tiny amount.How long must they observe to see a full cycle?

A) 25 days
B) 1 year
C) almost 12 years
D) It depends on how far away the observers are.

Correct Answer:

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