Planet is a celestial body

Planet is a celestial body that is moving in an elliptical path around the Sun. We consider only the major mass orbiting around the ecliptic plane and around them can circulate smaller bodies called Moon or natural satellites. There is a possibility that some bodies can bounce out from orbit in space.

As a matter of fact, they do not have their own source of energy like the Sun. After all, in their interior there is no nuclear fusion. These are usually rocky terrestrial Planets that have a solid planetary surfaces (close to the Sun) and are composed of a central metallic core, mostly iron and silicate rocks. Of course, substantially differ from larger gas giant Planets. Consisting mainly of some combination of hydrogen, helium and water existing in various physical states.

Structures on the Planet

Terrestrial Planets may have canyons, craters, mountains, volcanoes and other surface structures. In fact, it depending on the tectonic activity and the presence of water. They have a secondary atmosphere that was generated via a volcano or Comet impacts, as opposed to gaseous Planet having an atmosphere primarily made of gas from Nebula. For instance, it is believed that the Planets formed from a protoplanetary disk, the process of forming Star system. Gas and dust orbiting the Sun condensed into a rotating disk in the form of clumps of particles. In conclusion, they increase the mass under the influence of gravity, collide and form larger bodies.

Planets of our Solar System

All the Planets in the Solar System (besides Earth), are named after characters from Roman mythology. Uranus is named after a Greek god.

All the Planets of our Solar System, without smaller bodies or satellites like Moon (in order, from the Sun):

Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
"Pluto"