The table shows information about the moons of Mars. Moon Orbital Period (days) Average Distance from Mars (km) Phobos 0 point 3 1 9 9378 Deimos 23 comma 459 What is the orbital period of Deimos?

For moons orbiting the same planet, the square of the orbital period is proportional to the cube of the average distance. Thus Deimos’s period is 0.31 × (23,459 ÷ 9,378)^(3/2), which is about 1.23 days. The closest choice is 1.26 days.

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