Mars is the fourth planet from the Sun and named after the Roman god of war. It has a cold temperature ranging from -184°F to 80°F due to its distance of 142 million miles from the Sun. While scientists initially thought there was water on Mars, it is now known to exist mostly in the form of ice. The surface is composed of iron oxide and basalt, and the atmosphere contains nitrogen, oxygen, argon, carbon dioxide and other poisonous gases. With melting of ice to create water and machines to remove toxic gases, it may be possible for life to exist on Mars.