Which of the following extrasolar planets would be the most difficult to detect using the Doppler shift method?

Question

Quizplus · Accepted Answer

The Doppler shift method relies on detecting slight variations in a star's spectrum caused by the planet's gravitational tug as it orbits. The amount of Doppler shift is directly related to the mass of the planet and its distance from the star. However, a low mass planet far from its parent star would cause only a small Doppler shift, making it difficult to detect. A massive planet close to its parent star would cause a larger Doppler shift, and a low mass planet close to its parent star would also be easier to detect because it would orbit more quickly and produce more rapid variations in the spectrum. Thus, the most difficult planet to detect using the Doppler shift method would be a low mass planet far from its parent star.

Which of the Following Extrasolar Planets Would Be the Most