The table shows information about the moons of Mars.MoonOrbital Period (days)Average Distance from Mars (km)Phobos0.3199378Deimos 23,459What 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. Using Phobos’s period of 0.3199 days and the distances 9,378 km and 23,459 km, Deimos’s period is about 0.3199 × (23,459 ÷ 9,378)^(3/2) ≈ 1.26 days. So the correct choice is 1.26 days.

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