What Can Stop the Moon from Getting Farther from Earth

question 171

Multiple Choice

What can stop the Moon from getting farther from Earth?

• A) Nothing. The Moon will always drift away from Earth.
• B) The Moon will eventually drift beyond the range of Earth's gravity. Then the gravitational force of the bulge will end as will the Moon's drift.
• C) When Earth's rotation slows to match the motion of the Moon (synchronous rotation), the recession will end. The Moon will be directly in line with the bulge, and the bulge will no longer pull it outward.
• D) When tidal friction slows Earth's spin to zero, conservation of angular momentum will require that the Moon spiral inward toward Earth.

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