The net Mars is an interesting and mysterious planet. It is often referred to as the “Red Planet.” The rocks, soil, and sky all have a red hue on account of rust. Mars is the fourth planet from the sun at about 141 million miles (228 million kilometers) and the last terrestrial planet from the Sun. Mars follows closely behind Earth but is comparatively smaller, with about half the diameter of Earth (6,794-km) and about one-tenth of Earth’s mass (6.419 x 1023 kg). Thus the force of gravity on Mars is about one-third of that on Earth. Mars is probably the planet we know the most about since it is so close to Earth, though what we know now is not even close to everything about the planet. As time goes on, our knowledge of this mysterious planet will expand. Atmosphere The atmosphere of Mars is quite different from that of Earth. It is composed primarily of carbon dioxide with small amou....

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