The correct response is:
The speed of the moon increases.
As a moon draws closer to the planet it orbits, it experiences an increase in gravitational attraction, which causes it to speed up. This is in accordance with Kepler's laws of planetary motion, specifically the law of areas, which states that a line segment joining a planet and its moon sweeps out equal areas during equal intervals of time. This means that the moon moves faster when it is closer to the planet.
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