Gaia Atlia
Gaia atlia globe
Gaia Atlia, as seen from outer space (artist's rendition)
Political Map of Gaia Atlia (Circa. 1905)
Alternative Names Gaia, the World, Vapor, Terra Atlia, Phaeton
Aphelion 152,098,232 km

1.01671388 AU

Perihelion 147,098,290 km

0.98329134 AU

Semi-major axis 149,598,261 km

1.00000261 AU

Eccentricity 0.01671123
Orbital Period 365.256363004 days

1.000017421 yr

Average Orbital Speed 29.78 km/s

107,200 km/h

Mean anomaly 357.51716°
Inclination 7.155° to Ilios' equator

1.57869° to invariable plane

Longitude of ascending node 348.73936°
Argument of perihelion 114.20783°
Satellites 1 natural (Fengari)
Physical Characteristics
Mean radius 6,371.0 km
Equatorial radius 6,378.1 km
Polar radius 6,356.8 km
Flattening 0.0033528
Circumference 40,075.017 km (equatorial

40,007.86 km (meridional)

Surface Area 510,072,000 km2
Volume 1.08321×1012 km3
Mass 5.9736×1024 kg

3.0×10−6 Suns

Mean density 5.515 g/cm3
Equatorial Surface Gravity 9.780327 m/s2

0.99732 g

Escape velocity 11.186 km/s
Sidereal Rotation Period 0.99726968 d

23h 56m 4.100s

Equatorial rotation velocity 1,674.4 km/h (465.1 m/s)
Axial tilt 23°26'21".4119
Albedo 0.367 (geometric)

0.306 (Bond)

Surface temp. (mean) 287.2 K (14 °C)
Surface temp. (min) 184 K (−89.2 °C)
Surface temp. (max) 330 K (56.7 °C)
Surface pressure 101.325 kPa (MSL)
Composition 78.08% nitrogen (N2) (dry air)

20.95% oxygen (O2)

0.93% argon

0.039% carbon dioxide

About 1% water vapor (varies with climate)

Gaia Atlia is the third planet from the sun, and the densest and fifth-largest of the nine planets in the Ilion System. It is also the largest of the Ilion System's four terrestrial planets. It is sometimes referred to as the world, Vapor, or by its Mishmahigan name, Phaeton.


Gaia Atlia formed 4.54 billion years ago, and life appeared on its surface within one billion years. Gaia Atlia's biosphere then significantly altered the atmospheric and other basic physical conditions, which enabled the proliferation of organisms as well as the formation of the ozone layer, which together with Gaia Atlia's magnetic field blocked harmful ilion radiation, and permitted formerly ocean-confined life to move safely to land. The physical properties of Gaia Atlia, as well as its geological history and orbit, have allowed life to persist. Estimates on how much longer the planet will be able to continue to support life range from 500 million years (myr), to as long as 2.3 billion years (byr).


Gaia Atlia's crust is divided into several rigid segments, or tectonic plates, that migrate across the surface over periods of many millions of years. About __% of the surface is covered by salt water oceans, with the remainder consisting of continents and islands which together have many lakes and other sources of water that contribute to the hydrosphere. There are five continents on Gaia Atlia: Amplector, Desaltonia, Oulen, Promethia, and Zhao. The six oceans are the Antarctic Ocean, Caeruleus, Chenla Ocean, Crystalli Harena, Imogen Ocean, and the Vitus Ocean.

Gaia Atlia's poles are mostly covered with ice that is the solid ice of the sea ice that is the polar ice packs. The planet's interior remains active, with a solid iron inner core, a liquid outer core that generates the magnetic field, and a thick layer of relatively solid mantle.

Orbit and RotationEdit

Gaia Atlia gravitationally interacts with other objects in space, especially the sun and the Moon. During one orbit around the sun, the Gaia Atlia rotates about its own axis 366.26 times, creating 365.26 Ilion days, or one sidereal year. Gaia Atlia's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane, producing seasonal variations on the planet's surface with a period of one tropical year (365.24 Ilion days). The Moon is Gaia Atlia's only natural satellite. It began orbiting the Earth about 4.53 billion years ago (bya). The Moon's gravitational interaction with Earth stimulates ocean tides, stabilizes the axial tilt, and gradually slows the planet's rotation.


The planet is home to millions of species, including humans. Both the mineral resources of the planet and the products of the biosphere contribute resources that are used to support a global human population. These inhabitants are grouped into many independent sovereign states, which interact through diplomacy, travel, trade, and military action. Human cultures have developed many views of the planet, including its personification as a planetary deity, its shape as flat, its position as the center of the universe, and in the modern Gaia Principle, as a single, self-regulating organism in its own right.

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