Sol

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Sol
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Galactic
Coordinates
Region Central Orion Spur
Sector Sol Greater Expansion Area
Core distance 212.5 Exametres
(22,462 light years)
Physical
Spectral type G
Mass 1.9886 x 1030kg
Mean radius 696,340 km
Temperature 5778 K
Luminosity 1.0000 LS
Age 4.45 Gy
Planets 8
Habitation
System population ~15 billion
Government Federal Syndicate of Terra
Colonised Prehistoric
Capital planet Earth

Sol is a main-sequence type G star at the centre of the system in which Earth can be found. It is located in the Sol Greater Expansion Area being its centrepoint system, and is also the home system for terrankind.

System Structure[edit | edit source]

Sol is orbited by numerous planets of different composition, a main asteroid belt, and further out, a large region of icy bodies and comets.

Inner Planets[edit | edit source]

Sol's first four inner planets, Mercury, Venus, Earth, and Mars, are the star's only terrestrial planets, composed of a solid iron core, a silicate mantle, and a crust, or lithosphere. The terrestrial planets have craters, mountains and valleys depending on their other characteristics, however Earth is the only planet in the system with liquid water. They all bear atmospheres of wildly different volume and composition.

Asteroid Belt[edit | edit source]

Seperating Sol's inner planets with its outer planets is its asteroid belt. This belt bears some hazard to travellers in and out of the Sol system, and for the planets, namely Earth itself. It is believed that a planet was forming when Jupiter's gravity tore it apart, creating a collection of boulders and rocks.

Outer Planets[edit | edit source]

Sol's four outer planets, Jupiter, Saturn, Uranus, and Neptune, are all gas giants, composed of a solid rock core and fluid layers of metals and gases, although Jupiter and Saturn are typically helium and hydrogen-based, compared to Uranus' and Neptune's mostly water and ammonia composed structure.

Kuiper Belt and Oort Cloud[edit | edit source]

Beyond the orbit of Neptune, Sol is surrounded by a massive belt of smaller bodies made of methane, ammonia and water ice, a notable member of which being Pluto. Beyond the kuiper belt lies the Oort cloud, approximately 15.1 petametres in diameter, composed of billions more of these icy bodies.