th. But, after a closer look in 1976 by the American Viking mission, the differences on Mars exceeded the similarities. Mars is half the size of Earth and has two moons, Phobos, and Deimos. Like Earth, Mars is believed to be made up of several covers. A thick mantle rich in iron and finally a very thin crust follow its core, which is thought to be made up mostly of iron, with small amounts of sulfur, oxygen, and nickel. The crust is composed of basaltic rock similar to what is found at the bottom of Earth's oceans.
             Though Mars is smaller in size compared to other terrestrial planets, its
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