Multiple choice What is the time taken by Mars to complete one revolution around the sun? 555 days 528 days 687 days 678 days Reveal answer Fill a bubble to check yourself C Correct answer Explanation Mars takes approximately 687 Earth days (about 1.88 Earth years) to complete one revolution around the Sun. This orbital period is longer than Earth's 365 days because Mars is farther from the Sun and has a larger orbit to traverse.