Mars is the fourth planet from the Sun and the seventh largest. The planet probably got this name due to its red color; Mars is sometimes referred to as the Red Planet. Its color is caused by the iron oxides in the surface material. It has polar ice caps and surface features such as valleys, canyons, volcanoes and craters. As on Venus, the atmosphere is composed mainly of carbon dioxide (95%), but is much thinner. Mars' distance form the SUn reduces the amount of solar energy falling on its surface, so temperatures can be chilly, especially during the Martian night.
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