A Star Is Seen to Have Two Transiting Planets

question 64

Multiple Choice

A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits? (Hint: Review the use of Newton's version of Kepler's Third law from Ch. 4)

• A)Planet 2's semimajor axis is about 3 times smaller than Planet 1's.
• B)Planet 2's semimajor axis is about 3 times larger than Planet 1's.
• C)Planet 2's semimajor axis is about 5 times larger than Planet 1's.
• D)Planet 2's semimajor axis is about 5 times smaller than Planet 1's.

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