The planets Mars and Venus do not have any moons. Which of the following explanations for this ?

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Both Mars and Venus have small mean radii

Both Mars and Venus have small mass

Both Mars and Venus are closer to Sun

Both Mars and Venus do not have water on them to attract moons

answer is C.

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Detailed Solution

Concept: Most likely because they are too close to the Sun. Any moon with too great a distance from these planets would be in an unstable orbit and be captured by the Sun.
If they were too close to these planets they would be destroyed by tidal gravitational forces. Its dense, acidic atmosphere produces a runaway greenhouse effect that keeps the surface at around 865 degrees F year-round, which is hot enough to melt lead. Venus also has a smaller orbit than Earth, which makes its seasons shorter, and variations in temperature and conditions extremely slight.
Hence, option 3 is correct.

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