Artwork representing an unmanned mobile vehicle exploring the surface of Mars. Mars is the fourth planet from the Sun at an average distance of 230 million kilometres. It has a diameter of 6787km and the Martian year lasts about 687 terrestrial days. The atmosphere of Mars is mainly composed of carbon dioxide (95%) and nitrogen (2.7%). Daytime surface temperatures rarely rise above 0 Celsius and most areas experience minimum temperatures near -100 Celsius before sunrise. Several unmanned missions were launched to study this planet. Most of the data were gathered by the two space probes Viking 1 and 2 which landed on the Martian surface in August and September 1975.
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