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planet closest to the Sun; has a thin atmosphere with temperature extremes, an iron core, and many craters and high cliffs
second planet from the Sun; has a dense atmosphere with high temperatures, a surface with craters, faultlike cracks, and volcanoes; sometimes called Earth's twin. NO MOONS
fourth planet from the Sun; appears reddish because of iron oxide in weathered rocks; has polar ice caps, a thin atmosphere, and two moons: phobos and deimos
largest planet and fifth planet from the Sun; has faint rings, 63 moons, an atmosphere formed mostly of hydrogen and helium, and its surface has continuous storms
second-largest and sixth planet from the Sun; has a complex ring system, at least 31 moons, and a thick atmosphere made mostly of hydrogen and helium
smallest planet and usually considered to be the ninth planet from the Sun; has a thin atmosphere and a solid, icy-rock surface. 3 moons
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