Planets of the Solar System

The terms "inferior planet" and "superior planet" were coined by Copernicus to distinguish a planet's orbit's size in relation to the Earth's. ...more on Wikipedia about "Inferior and superior planets"

An inner planet is any one of the Solar system's rocky planets that lie inside the asteroid belt: Mercury (planet), Venus (planet), Earth (planet) and Mars (planet). The remaining planets are deemed the outer planets. ...more on Wikipedia about "Inner planet"

Mesoplanet is a term coined by Isaac Asimov to refer to planetary bodies with sizes smaller than Mercury but larger than 1 Ceres. At the time Asimov coined the term, it included only Pluto; now, however, the classification would also include 2003 UB313, 2005 FY9, 2003 EL61, 90377 Sedna, 90482 Orcus, 50000 Quaoar, and 20000 Varuna if size is defined by radius (the masses of many planetary bodies are not accurately known). ...more on Wikipedia about "Mesoplanet"

An outer planet of the Solar system is any of the gas giants: Jupiter, Saturn, Uranus or Neptune. The remaining planets are deemed the inner planets. ...more on Wikipedia about "Outer planet"

Planetary nomenclature, like terrestrial nomenclature, is used to uniquely identify a feature on the surface of a planet or natural satellite so that the feature can be easily located, described, and discussed. ...more on Wikipedia about "Planetary nomenclature"

In traditional Western astrology, the planets have the significances listed below. These significances have been handed down since ancient times. Note that in astrology, the Sun and Moon are referred to as "planets" for the sake of convenience and following pre-astronomical definition of "planet". Sometimes the Sun and Moon are referred to as The Lights or the luminaries. ...more on Wikipedia about "Solar system in astrology"

Ever since the discovery of Pluto, the existence of a tenth planet has been speculated by astronomers and the general public alike. Tenth planets have frequently appeared in fiction, and media reports of new trans-Neptunian object (TNO) discoveries have also used the label with some frequency. ...more on Wikipedia about "Tenth planet"

A terrestrial planet or telluric planet is a planet which is primarily composed of silicate rocks. The term is derived from the Latin word for Earth, " Terra", so an alternate definition would be that these are planets which are, in some notable fashion, "Earth-like". Terrestrial planets are substantially different from gas giants, which may not have solid surfaces and are composed mostly of some combination of hydrogen, helium, and water existing in various physical states. Terrestrial planets all have roughly the same structure: a central metallic core, mostly iron, with a surrounding silicate mantle. The Moon is similar, but lacks an iron core. Terrestrial planets have canyons, craters, mountains, and volcanoes. ...more on Wikipedia about "Terrestrial planet"

The five traditional planets are the five planets that ar visible to the naked eye, and have been known since time immemoriam. ...more on Wikipedia about "Traditional planets"

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