The Moon Rotates Synchronously as It Orbits Earth, Always Keeping

question 293

Multiple Choice

The Moon rotates synchronously as it orbits Earth, always keeping one side pointed toward Earth, because

• A) of the effect of the magnetic field of Earth on the magnetic field of the Moon, much like the effect on a compass needle.
• B) it had precisely this rate of spin, equal to its revolution period around Earth, when it was formed.
• C) of frictional effects from micrometeoroids in its orbital plane, especially early in its history.
• D) of the effect of the gravitational pull of Earth on the tidally induced bulge on the Moon.

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