Imagine a Planetary System with a Star and a Single

question 266

Multiple Choice

Imagine a planetary system with a star and a single Earth-mass planet. Astronomers determine that the planet follows an elliptical orbit. What orbit does the star follow?

• A) It remains motionless, because it is so much more massive than the planet.
• B) It follows an elliptical orbit with the center of mass of the system at one focus.
• C) It remains motionless, because it is so far from the planet.
• D) It follows an elliptical orbit with the planet at one focus.

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