Earth

Earth of Reality-100, often referred to as the world, was the inhabited third planet of the Sol system. Earth was the homeworld of the Humans and was the capital planet of the Lux Republic. It is a terrestrial (rocky) planet, both the densest planet in the system and the largest of the system's four terrestrial planets. It is notably the home world of mankind and one of very few astronomical objects known to accommodate indigenous life. Earth has one moon, Luna, which was the first astronomical body beyond Earth to be colonised by humans.
== Geographic information ==
Earth, also called the world (and, less frequently, Gaia or, in Latin, Terra), is the third planet from Sol, the densest planet in the Sol system, the largest of the Sol system's four terrestrial planets, and the only astronomical object known to accommodate life in the Sol system. The earliest life on Earth arose at least 3.5 billion years ago. Earth's biodiversity has expanded continually except when interrupted by mass extinctions. Although scholars estimate that over 99 percent of all species of life (over five billion) that ever lived on Earth are extinct, there are still an estimated 10–14 million extant species, of which about 1.2 million have been documented and over 86 percent have not yet been described. Over 7.3 billion humans live on Earth and depend on its biosphere and minerals for their survival. Earth's human population is divided among about two hundred sovereign states which interact through diplomacy, conflict, travel, trade and communication media.
According to evidence from radiometric dating and other sources, Earth was formed about 4.54 billion years ago. Within its first billion years, life appeared in its oceans and began to affect its atmosphere and surface, promoting the proliferation of aerobic as well as anaerobic organisms and causing the formation of the atmosphere's ozone layer.[clarification needed (O3 created from O2 + UV radiation)] This layer blocks the most life-threatening parts of the Sun's radiation, enabling life to flourish on land as well as in water. Since then, the combination of Earth's distance from the Sun, its physical properties and its geological history have allowed life to thrive and evolve.
Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. Seventy-one percent of Earth's surface is covered with water, with the remainder consisting of continents and islands that together have many lakes and other sources of water that contribute to the hydrosphere. Earth's polar regions are mostly covered with ice, including the Antarctic ice sheet and the sea ice of the polar ice packs. Earth's interior remains active with a solid iron inner core, a liquid outer core that generates the magnetic field, and a convecting mantle that drives plate tectonics.
Earth gravitationally interacts with other objects in space, especially the Sun and the Moon. During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar days or one sidereal year. Earth'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 solar days). The Moon is Earth's only permanent natural satellite. Its gravitational interaction with Earth causes ocean tides, stabilises the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate.
== Planetary data ==
Earth was a spheroid-shaped terrestrial planet with a circumference of 24,874 miles (40,075 kilometres), a mass of 5.98×1024 kilograms and a mean density of 5.517. Its atmosphere had an average temperature of 75 °F (24 °C) and consisted of 78% nitrogen, 21% oxygen, and smaller percentages of krypton, neon, and argon.
The Earth system consisted of a large natural satellite named Luna.
=== Location ===
Earth's orbit around its sun, Sol, measured more than two hundred million kilometers in diameter. Earth was located in the Soliar Region, less than 100 light years from the boundary to the Bearia Region. It was a little over twenty light years away from the planet Suezeus and it was less than fifty light years away from the planet Partzenosis.
Category:Planets
Category:Locations
Category:Reality-100
Category:Sol system
Category:Soliar Region
Category:Sector-01