There are eight planets in the Solar System. The largest is Jupiter, at 318 Earth masses. The smallest is Mercury, at 0.055 Earth masses. In increasing distance from the Sun, the planets are:
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
The larger bodies of the Solar System can be divided into categories based on their composition:
Terrestrials: Planets (and possibly dwarf planets) that are similar to Earth, with bodies largely composed of rock: Mercury, Venus, Earth and Mars.
Gas giants: Planets with a composition largely made up of gaseous material and are more massive than terrestrials: Jupiter, Saturn, Uranus, Neptune.
Ice giants are a sub-class of gas giants, distinguished from gas giants by their depletion in hydrogen and helium, and a significant composition of rock and ice: Uranus and Neptune.
