Atmosphere/Legends



During the height of the Galactic Empire's colonial period, a system of classification for atmospheres was established. This system, which was afterward used throughout the galaxy, separates atmospheres into four categories.

Type I Atmospheres
Breathable

Has appropriate levels of oxygen, nitrogen, and hydrogen to be breathable by humans and human analogues. Some contaminants or other trace gases can have long-term detrimental effects. Most aliens can breathe Type I atmospheres. Planets with a Type I atmosphere almost always have some form of life.

Type II Atmospheres
Breath Mask Suggested

Usually has appropriate levels of atmospheric oxygen and nitrogen. Due to lack of sufficient pressure, or contaminants, or trace gases, these atmospheres usually cause detrimental effects of humans, and human analogues over a shorter period of time. Many aliens can breathe Type II atmospheres without any trouble, depending on physiology. Planets with a type II atmosphere usually support some form of life.

Type III Atmospheres
Breath Mask Required

Due to either lack of appropriate levels of atmospheric oxygen, nitrogen, sufficient pressure, contaminants, or trace gases, a breath mask must be worn. For humans, and human analogues these atmospheres cause immediate or eventual impediments, or incapacitation. Some alien species can breathe these types of atmospheres depending on physiology, and biology. Planets with a type III atmosphere sometimes support life.

Type IV Atmospheres
Environment Suit Required

Can either be toxic, flammable, or non-existent; these atmospheres cannot be breathed by humans, or human analogues. If tried to breathe, these atmospheres would cause immediate incapacitation, or death. Few alien species can breathe this type of atmosphere. Planets with a type IV atmosphere rarely support life.