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The Doppler method allows us to find a planet's semimajor axis using just the orbital period...

The Doppler method allows us to find a planet's semimajor axis using just the orbital period and the star's mass (Mathematical Insight Finding Orbital Distances for Extrasolar Planets).

a) Imagine that a new planet is discovered orbiting a 2 MSun star with a period of 9 days . What is its semimajor axis?

Express your answer using three significant figure. (m)

b) Another planet is discovered orbiting a 0.7 MSun star with a period of 100 days. What is its semimajor axis?

Express your answer using three significant figure. (m)
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