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2.7% Nitrogen

1.6% Argon

0.2% Oxygen

0.07% Carbon monoxide

0.03% Water vapor

0.01% Nitric oxide

2.5 ppm Neon

300 ppb Krypton

130 ppb Formaldehyde

80 ppb Xenon

30 ppb Ozone

Mars (pronounced /ˈmɑrz/) is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the "Red Planet" because of its reddish appearance as seen from Earth.

Mars is a terrestrial planet with a thin atmosphere, having surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. It is the site of Olympus Mons, the highest known mountain in the Solar System, and of Valles Marineris, the largest canyon. In addition to its geographical features, Mars’ rotational period and seasonal cycles are likewise similar to those of Earth.