With the aid of a diagram, explain how the Doppler effect can be used to detect the pres- ence of an unseen planet around a nearby star. State how an astronomer can determine if the planet is on a circular or eccentric orbit.

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With the aid of a diagram, explain how the Doppler effect can be used to detect the pres- ence of an unseen planet around a nearby star. State how an astronomer can determine if the planet is on a circular or eccentric orbit.
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