Discussion
Which planet is known as the Red Planet?
Answer: A
Correct answer: Mars
Mars is the Red Planet, and the colour comes from iron oxide - rust - in the dust covering its surface. It is the fourth planet from the Sun and about half the Earth’s diameter. Its day is close to ours at 24 hours 37 minutes, and its axis is tilted by a similar amount, so it has seasons; but its atmosphere is thin and almost entirely carbon dioxide, and its average temperature is around −60°C. It carries the largest volcano in the solar system, Olympus Mons, and the vast canyon system of Valles Marineris. Abundant evidence of ancient river valleys and lake beds shows that liquid water once flowed there, which is why it is the main focus of the search for past life. It has two small moons, Phobos and Deimos, probably captured asteroids. India’s Mangalyaan reached Mars orbit in 2014 at the first attempt.
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