QUESTIONS ABOUT MARS Q. How long does it take Mars to spin on its axis? A. Mars spins on its axis once every 24.6 hours. Q. How long does it take Mars to orbit the Sun? A. Mars orbits the Sun in 687 days. Q. What is the atmosphere of Mars made of? A. Oxygen, carbon monoxide and other gases make up 0.4% of the atmosphere. Argon makes up 1.6%. Nitrogen makes up 2.7%. Carbon dioxide makes up 95.3%. Q. What is the structure of Mars? A. The mantle is made of silicate rock. The crust is made of rock. The core is probably made of iron. Q. How big is Mars? A. Mars is about half the size of the Earth. Q. What is the average temperature of Mars? A. The average temperature of Mars is -63C. The temperatures can vary from -125C to 22C. Q. How many moons does Mars have? A. Mars has two moons. The moon are called Deimos and Phobos. Deimos orbits Mars in 30.3 hours at an altitude of 20,040 km. It is 16 km at its widest. Phobos orbits Mars in 7.66 hours at an altitude of 5,980 km. It has an diameter of 26 km.
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