Definition:Planet

Definition
A planet is a celestial body which orbits a star (or the remains of a star) that:


 * $(1): \quad$ has enough mass so that its own gravitational field makes it approximately spherical
 * $(2): \quad$ does not have enough mass to trigger thermonuclear fusion
 * $(3): \quad$ has cleared its neighbouring region of planetesimals.

Also see
The planets of the solar system are:


 * Definition:Mercury (Planet)
 * Definition:Venus
 * Definition:Earth
 * Definition:Mars
 * Definition:Jupiter
 * Definition:Saturn
 * Definition:Uranus
 * Definition:Neptune

While Pluto was once classified as a planet, its status was since been reclassified as a dwarf planet.

Also note the possible existence of a ninth planet.