How many Earth days does Mars take to complete one revolution around the Sun?

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A 687 Earth days
B 686 Earth days
C 642 Earth days
D 691 Earth days

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Answer: A. 687 Earth days

Mars takes about 687 Earth days to go around the Sun once. It is farther from the Sun than Earth, so its orbit is longer and it moves more slowly.

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How many Earth days does Mars take to complete one revolution around the Sun?

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