By Studying the Orbit of a Moon Around Its Parent

question 16

Multiple Choice

By studying the orbit of a moon around its parent planet, astronomers can use ________ to find the parent planet's ________.

• A) escape velocity; rotation rate
• B) the moon's eccentricity; Roche limit
• C) small perturbations; magnetic field strength
• D) the moon's velocity; radius
• E) Newton's version of Kepler's third law; mass

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