Marte, also known as Mars, is the fourth planet from the Sun in our solar system. It is often referred to as the "Red Planet" due to its reddish appearance, which comes from iron oxide, or rust, on its surface. Mars has a thin atmosphere, primarily composed of carbon dioxide, and features the largest volcano, Olympus Mons, and the deepest canyon, Valles Marineris, in the solar system. Mars has two small moons, Phobos and Deimos, which are thought to be captured asteroids. The planet experiences seasons similar to Earth, but they last about twice as long due to its longer orbit. Mars has been a target for exploration, with numerous missions from NASA and other space agencies seeking to understand its geology and potential for past life.