Mars has two very small moons, called Phobos and Deimos. The planet Mars is made of rock. The ground there is red because of iron oxide (rust) in the rock and dust.[1] The planet has a small carbon dioxide atmosphere. The temperatures on Mars are colder than on Earth, because it is far away from the Sun. There is some ice at the north and south poles of Mars, and also frozen carbon dioxide. Mars does not have any water on the surface now, except at the poles, but most scientists think it used to have water.
The average thickness of the planet's crust is about 50 km (31 mi), with a maximum thickness of 125 km (78 mi).[2] Earth's crust, on average 40 km (25 mi), is three times smaller as Mars’ crust based to the sizes of the two planets if they are made equal.
[change] Life on Mars
Because Mars is the closest to the Earth in the Solar System, people have wondered if there is any kind of life on Mars. Mars has the most similar seasons to Earth of all the planets in our Solar System. However, since Mars is further than the Earth from the sun, the seasons of this planet last longer than those of Earth. As a result, a year of Mars is longer than a year of Earth.
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