Terrestrial Class

Size range 1,001 to 30,000 kilometers. These are the rocky planets, a deceptive name as not all of these worlds will be rocky. Their composition can be quite varied, as can their surface features and conditions. Earth is a terrestrial world, and in this Class is found all of the Gaian Type and Subtype worlds.

The designation Terrestial was replace by "Rocky planet" in 2143

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Examples

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Vulcanian
Volcano world...these planets are active geologically due to a variety of reasons. Also, these planets may be of any age. Early, still forming planets are often quite active, as are worlds that have grown close to their stars which have begun to swell into giants. Extreme tidal flexing also is a large cause of activity.
 * Io
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Ferrinian
Metal world ...extremely rare, bordering on the impossible in the upper size ranges, due to the lack of material available in the pre-solar nebula. Likely, these worlds can form only about large hot stars. Heavy Metal
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Mercurian
Rock world with an appreciable metal core
 * Mercury
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Selenian
Rock world which is essentially dead
 * Luna
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Eoarean
~ Geologically active, these Arean worlds can have substantial atmospheres, geochemical recycling processes, even open areas of water. Life is indeed possible, though it is unlikely to develop very high.
 * Often times of smaller mass, these worlds are uninhabitable, and marked by vast expanses of open rock land or sands.  wind, for the most part, seems to be the dominant weathering mechanism.  Geological activity varies, but the older the world, the less active it is.  Atmospheres too will tend to thin the younger they are.  If a moon, these worlds may remain geologically active throughout its history, due to tidal flexing.
 * Often times of smaller mass, these worlds are uninhabitable, and marked by vast expanses of open rock land or sands.  wind, for the most part, seems to be the dominant weathering mechanism.  Geological activity varies, but the older the world, the less active it is.  Atmospheres too will tend to thin the younger they are.  If a moon, these worlds may remain geologically active throughout its history, due to tidal flexing.
 * Early Mars
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Euarean
"Fossilized" rock world...early in their history these worlds were marked by geological activity, substantial atmospheres, even the presence of liquid water and primitive life. But, for a variety of reasons, these processes 'atrophied', leaving behind a planet with only signs of its past potential. Life may remain in secluded and protected areas, but it is not a common occurrence. These worlds are the best candidates for successful terraforming.
 * Mars
 * Epsilon II
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Eogaian [1]
Earth-like worlds...these planets share a common method of geologic, biologic, and atmospheric evolution. Such planets have been divided up more than any other type, due to their extreme interest and importance to the colonizers of space. In many cases, Subtypes have been created, whereas other planet Types would not be so delineated. ~ A young world with shallow oceans and a primitive atmosphere, and possibly the earliest life.
 * Paleo
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Hyperarid
Less than 10% of the surface is covered with oceans. Desert conditions prevail, and life may be quite limited. New Algiers

Alvor's Cove
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Arid [1]
Ten to 25% of the surface is ocean covered. The climate is predominantly continental, and mainly desert conditions prevail. The seas are typically very saline, and may be nearly uninhabitable in extreme cases. Life is quite restricted.
 * Andora
 * Shiss-Taa
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Campian [1]
Twenty-five to 50% of the surface is ocean covered. The climate is predominantly continental, though oceanic climates may extend for some distance beyond the seas. The seas, if small and restricted, can be extremely saline. Life is less prolific than on wetter worlds, but can still be quite diverse. Splish Splash

Para Para
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Paludial [1]
Oceans cover 50 to 85% of the surface. There is low surface relief, and the land and water are mixed in the forms of extensive swamps, lakes, forests, and semi-open woodland. The climate is predominantly oceanic, with a higher than average global temperature due to the lack of an oceanic heat transfer system. Life can be quite diverse.
 * Ulta
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Eugaian [1]
Oceans cover 50 to 85% of the surface in the forms of large oceans. The climate is varied, but tends to maintain an average. Life is prolific and diverse.
 * Earth
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Pelagic [1]
Oceans cover 85 to 100% of the surface. There may be extensive continental shelves, small continents, or only islands. Life on these lands may be sparse, due to the fact that there never has been a long term land mass for life to develop on;  likewise, life on land might be diverse, due to recent global flooding, in which land life has had millions of years to develop on previously large continents. An oceanic climate dominates. Nilfeheim

Maritim
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Bathypelagic
[1] Oceans cover the entire surface, and there is a marked absence of continental shelves. The oceans themselves are kilometers deep. Life may indeed be prolific, but it is highly unlikely that a technically advanced intelligence will develop here.
 * Deep Blue
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Tundral [1]
A world that is locked in the grip of coldness. Glacial and tundral landscapes are the norm. These worlds may be a transitory stage in the ultimate and fatal freezing of a Gaian world, or they may have reached a climatological equilibrium. Such worlds differ from Gaian planets in the throws of an Ice Age in that this climatic level is long term, on the order of many millions of years, and that it is nearly a planetwide effect. Botna

Richter 4
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Venusian
Characterized by a hot, sterile, and barren landscape beneath crushing atmospheric pressures. Often times, these worlds have the highest temperatures of any planet or moon in the entire solar system. Geological activity may remain, or the world may be entering into a period of planetary senescence. Arsenal II
 * Venus
 * Venus
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Titanian
These worlds are often small, yet retain substantial atmospheres due to their low temperatures, a result of being a fair distance from the stellar primaries.
 * Titan
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Lithic-Gelidian
These Europans are the ultimate in this type of world. The planet has a thick  crust of ice, though this thickness depends both on the amount of heat received by the local star, and the amount of tidal flexing. However, there is no open surface water, and any atmosphere is quite thin, being supported by gas release from surface fissures. The water mantle is also likewise as deep as these two factors dictate. At an extreme, there may only be subsurface reservoirs, centered on local hotspots, rather than a global ocean. The core of the world is predominantly icy, with some rocky material. Life is usually quite limited, and restricted to areas about the hotspots, though there may be hardy long ranging forms.
 * Europa
 * Ganymede
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Plutonian
Ice-rock world. Located farther out from the stellar primary, these worlds have a higher proportion of ice than rock in their mixed composition.
 * Triton
 * Pluto
 * Ariel
 * Titania
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Glacian
Ice world ...some rock. Because they are located so far from the parent sun, very little rock was incorporated into their formation. They are very close, in fact, to being Kuiperian in nature. [1] These terms have been replaced by the more detailed Gardenworld Classification system (GWC)
 * Charon
 * Oberon
 * Rhea
 * Iapetus
 * Umbriel
 * Tethys
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