Discussion
Which of the following statements are correct in relation to the rotational characteristics of planets in our solar system ?
i. With the exception of Venus and Mars, all the planets rotate in the same clockwise direction.
ii. With the exception of Uranus and Neptune, all the planets rotate in the same counter clockwise direction.
iii. With the exception of Venus and Uranus, all the planets rotate in the same counter clockwise direction.
iv. All the planet's orbits lie close to the same plane (the plane of the ecliptic) passing through the Sun's equator.
Answer: D
Statements iii and iv are correct, so the answer is Only (iii and iv).
iii is correct: seen from above the Sun's north pole, all planets rotate counter-clockwise except Venus, which rotates backwards, and Uranus, which is tilted on its side and rotates retrograde. iv is correct: the planets' orbits lie close to one plane, the plane of the ecliptic, a relic of the flat disc from which the solar system formed.
i is wrong: the common direction is counter-clockwise, not clockwise, and Mars rotates the same way as Earth. ii is wrong: Neptune rotates in the normal direction.
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