Atmosphere

Creating inhabitable environments

Large asteroids

Other celestial bodies

Atmospheres are collections of gases that cover any sufficiently large celestial body that has enough gravity to hold the atmosphere in place, such as planets, moons, large asteroids, and Planetoids. In addition, spacecraft and stations, as well as airtight structures within inhospitable environments, have their own atmospheres, which are meant to be breathable to the crew. Atmospheres were divided into categories, referred to as types, by the Trans-Galactic Government. Similar systems of classifications are used by other states and organizations.

## Atmosphere types

### Type 1

Type 1 atmospheres, often registered as simply "breathable," is the most common type of atmosphere on inhabited planets and moons. Such atmospheres are oxygen-rich, and are breathable to Humans and most other lifeforms. Such atmospheres are most common on terrestrial worlds, but rarely make up the upper atmosphere of gas giants. Such atmospheres also contained ozone layers or layers of similar chemicals.

#### Examples of Type 1 atmosphere worlds:

* Amer
* Earth
* Eiel Britonica
* Ica
* Illal
* Lodceo
* Mona IV
* New Earth
* Reeferon
* Uteria
* Valiant Prime (after cyberforming)

### Type 2

Type 2 atmospheres, often registered as "semi-breathable," are atmospheres filled with chemicals or other substances, such as pollutants, which could be harmful to many species, lacked sufficient levels of breathable gases, or had pressures that would prove harmful to most. Non-natives of Type 2 atmosphere world would often require breathing masks or sealed environments to survive on Type 2 atmosphere worlds, or else they could suffer several ill effects, such as poisoning, which could even lead to death if they breathe in the air for too long. Natives of Type 2 atmosphere worlds most often require their own breathing masks to breathe properly in any other atmosphere. Type 2 is further classified into Type 2a, worlds that are merely polluted or carry small amounts of different chemicals, such as volcanic worlds, where a respirator is suggested, and Type 2b, which requires a breathing mask to survive on for prolonged periods of time.

#### Examples of Type 2a atmosphere worlds:

* Dakk III
* Darssors
* Melliconus Prime

#### Examples of Type 2b atmosphere worlds:

* Infernis
* The Rage
* Vargos Prime (prior to cyberforming)

### Type 3

Type 3 atmospheres, often registered as "toxic," or "inhospitable," are atmospheres which are filled with high amounts of toxins, high amounts of harmful chemicals, extremely low or extremely high pressure, a composition that is meant to sustain non-carbon based life, or be insufficiently developed to house most gases or ozone layers, sometimes even being near-nonexistent. Large asteroids, most moons, and "death worlds" have this type of atmosphere, and rarely support life. Non-carbon-based lifeforms, such as the silicon-based Galinons or the boron-based Diablans, have been known to arise on such incredibly hostile worlds. However, for the most part, Type 3 atmosphere worlds have no native life, and lifeforms that arrive on such worlds require fully-sealed environmental suits to survive, as the atmosphere is capable of crushing them, quickly burning or freezing them, or simply killing them when they take a breath.

#### Type 3 atmosphere worlds

* Cordis
* Mars
* Mercury
* Moon
* Pluto
* Valiant Prime (prior to cyberforming, as Debreather)
* Venus