Planetary Geology

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Mercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune

Mercury, Venus, Earth, Mars, Jupiter, Uranus, Saturn, Neptune

5.65

5.51

5.45

A fragment of material that falls to the Earth

A fragment of rock that falls to the Earth from space

A fragment of rock that failed to form a planet

4700 million years

4300 million years

4500 million years

4400 million years

4600 million years

Jupiter and Saturn

Jupiter and Mars

Saturn and Uranus

Mars

Jupiter

Saturn

A dwarf planet and always has been

A dwarf planet that was reclassified from a planet in August 2006

A dwarf planet that was reclassified from a planet in August 2003

A satellite orbiting a planet

A natural satellite orbiting a planet

A natural satellite orbiting a plant

14 billion years ago

12 billion years ago

10 billion years ago

16 billion years ago

Hydrogen and Helium

Hydrogen and Halite

Hydrogen and Sulphur

Carbon Dioxide and Helium

Nitrogen and Helium

10-20

21-30

31-40

41-50

51-60

61+

A sizable object orbiting a star

A small object orbiting a star

A sizable object that is orbited by the Sun