Earth Earth symbol.svg
Earth link
Alternate names Terra, Tellus, Gaia
Orbital Characteristics
Aphelion 153,893,552 km
Perihelion 147,935,205 km
Semi-major axis 150,914,378 km
Eccentricity 0.01974081
Orbital period 363.14743086 days
Satellites 0
Physical characteristics
Mean radius 6,284 km
Equatorial radius 6,291 km
Polar radius 6,279 km
Circumference 39,483.536 km
Surface area 496,229,086. km²
Volume 1,039,434,526,226³
Minimum -78°C
Median 16°C
Maximum 51°C
Atmosphere composition
Nitrogen 73.6%
Oxygen 25.5%
Argon 0.080%
Carbon dioxide 0.053%
Note - To avoid confusion, all data present on this graph
are presented from the perspective of our universe

Earth is the third planet from the sun, the most dense, and the fifth largest of all the planets in the Solar system. Earth, alongside its "sister planet" Theia, is one of only two planets capable of sustaining life within its planetary system.

Along with the other planets within the Solar system, it formed around 4.54 billion years ago, within the habitable zone. Its cooling took around 1 billion years (Gya), and as a result, it formed a permanent crust that is splintered into sections forming the planets tectonic plates. During the cooling period, a mixture of comets and asteroids carrying life crashing onto the planet, covering its surface in liquid water that managed to remain on said surface due to the planets magnetosphere, the largest of the five terrestrial planets.

Around 3.5 Gya, life, like on Theia, began to evolve from the basic chemicals, before proliferating. However, despite lying within the habitable zone, the lack of any major stabilising force knocks the planet over on its axis to around 15 to 20 degrees every 50,000 years, swinging the climate from warm and hot, to frigid and cold. It was only in a longer than usual period of warm 400 million years ago in which complex life began to develop, the Cranian Period. Since then, Earth, as a water-world planet, has been able to maintain complex life living beneath its surface, with only 1% of its life living above the surface on small, volcanic islands.

Silent Skies Template
Theia link Theia Theian HistoryTheian TimescaleFuture of TheiaTheian Biomes
Earth Terran HistoryTerran TimescaleFuture of EarthTerran Biomes
Lares Laretian History
Viruses and bacteria
Theian Life Theian SpeciesTheian Energy SourcesEvolutionTheian BiosphereExtinctions
Terran Life Terran SpeciesTerran Energy SourcesEvolutionTerran BiosphereExtinctions
Ocean Planet
Theian Geography ContinentsPlate TectonicsAtmosphereStructure
Terran Geography IslandsPlate TectonicsAtmosphereStructure