Compositional data for selected solar system objects

object distance from Sun (AU)* mean density (g/cm³) general composition

Sun -- 1.4 hydrogen, helium

Mercury 0.4 5.4 iron, nickel, silicates

Venus 0.7 5.2 silicates, iron, nickel

Earth 1 5.5 silicates, iron, nickel

Moon 1 3.3 silicates

Mars 1.5 3.9 silicates, iron, sulfur

asteroids (asteroid) 2-4.5 (main and outer belts) typically 2-4 silicates, iron, nickel

Jupiter 5.2 1.3 hydrogen, helium

Io 5.2 3.6 silicates, sulfur

Europa 5.2 3.0 silicates, water ice (crust)

Ganymede 5.2 1.9 water ice, silicates

Callisto 5.2 1.8 water ice, silicates

Saturn 9.5 0.7 hydrogen, helium

Tethys 9.5 1.0 water ice

Titan 9.5 1.9 water ice, silicates, organics

Centaur objects (Centaur object) 5-30 (mainly between orbits of Jupiter and Neptune) possibly less than 1 presumed similar to that of comets: water ice, other ices, traces of silicates

Uranus 19.2 1.3 ices, silicates, hydrogen, helium

Neptune 30.1 1.6 ices, silicates, hydrogen, helium

Triton 30.1 2.0 water ice, silicates, organics

Pluto 39.5 2.0 water ice, silicates, organics

Kuiper belt objects 30-50 (main concentration) possibly less than 1 presumed similar to that of comets: water ice, other ices, traces of silicates, organics

Oort cloud objects 20,000-100,000 possibly less than 1 presumed similar to that of comets: water ice, other ices, traces of silicates, organics

*One astronomical unit (AU) is the mean distance of Earth from the Sun, about 150 million km.