The MOST Plausible Explanation for the Retrograde Rotation (Rotation in a Direction

question 30

Multiple Choice

The MOST plausible explanation for the retrograde rotation (rotation in a direction opposite that of most other planets) of Venus is the

• A) frictional slowing down and eventual reversal of Venus's rotation by tidal forces at a time when the planet had deep oceans over its surface.
• B) frictional drag of its very dense atmosphere on the rotating planet throughout its history.
• C) combined gravitational effects of its neighboring planets, Mercury and Earth.
• D) impact of a massive object on it early in its history.

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