Question

Earth takes 365 days to revolve around the Sun whereas, Mars takes 687 days to complete one revolution around the sun. Why do Mars take more time than earth to complete its revolution around the Sun?

Answer 1

Since, Mars is at a greater distance than earth from the Sun. Therefore, Mars takes more time to complete a revolution around the Sun, and one year is of 687 days at mars. Period of revolution of a planet increases as its distance from the Sun increases.