The Inner Planets Mercury Venus Earth Mars
Four closest planets to the sun All have rocky surfaces Known as terrestrial planets
Mercury 3.2 Light Minutes from Sun 4,879 km Diameter Almost no atmosphere -173 to 427 C degree surface temperature
Venus 6.0 Light Minutes from Sun Known as Earth’s Twin 12,104 km diameter Retrograde Rotation Very dense atmosphere 464 C degree surface temperature
Earth 8.3 Light Minutes from the Sun 12,756 km diameter Water on Surface Livable Atmosphere -13 to 37 C degree surface temperature
Mars 12.7 Light Minutes from Sun 6,794 km diameter -123 to 37 C degree surface temperature Huge Volcanoes and Mountain Ranges Polar Ice Caps Very thin atmosphere