A year is the length of time it takes for a planet to complete one entire orbit around the sun. If each of the planets revolved around the sun at exactly the same speed, which of the planets would have the longest year?


Being farthest from the sun, Mars has the longest orbital distance. Therefore, if all planets were to travel at the exact same speed, Mars would complete its orbit in the greatest amount of time— (D) is correct. Note that this question asks for an extreme answer. Even if you don’t know the right answer, you can eliminate the two answers that are not the extremes (Earth, Venus) right away.

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