Registered planets are categorised based on several aspects. Among many others, atmosphere is one of the most important aspects as planets' atmosphere determines its habitablitiy, defines its flora and fauna and most importantly, it also specifies the dangers you may have to face in each atmosphere.

Atmoshpere TypesEdit

Type I


Type I atmospheres have appropriate levels of oxygen, nitrogen, and hydrogen and are breathable by the majority of the known species. Planets with this type of atmosphere are likely to have some form of life on them. Plant life that frees oxygen are present on all type I atmosphere - all oxygen would be bound to other elements within a matter of months without such to free it up.

Type II Breath       Mask Suggested

Type II atmospheres usually have some levels of atmospheric oxygen and nitrogen. Due to lack of sufficient pressure or the presence of contaminants and/or of other trace gases  these atmospheres usually cause detrimental effects to some species over a shorter period of time. Some Type II atmosphere have low levels of toxic gas present and some species require breath support masks while outside.

Some species, however, are used to and are able to breathe even the toxic air of these planets.

Type III

Breath Mask Required

Within all Type III atmospheres, due to either the lack of appropriate levels of atmospheric oxygen, nitrogen and/or sufficient pressure and/or the presence of contaminants and/or of trace gases, a breath mask has to be worn, in case of some species, an environment suit as well. Many Type III atmospheres have a relatively higher level toxicity and/or very highh/low temperature.

Planets with a Type III atmosphere however, very rarely support native life.

Type IV

Environment Suit Required

Type IV atmospheres are either highly toxic, flammable, overly freezing or nonexistent; these types of atmospheres cause immediate incapacitation or death to most species of the galaxy. No known species are able to breathe in Type IV atmospheres.

Toxicity levelsEdit


No gas mask needed to survive for most of the creatures.


Gas mask is recommended for most oxygen breathing creatures, as small traces of toxic gases are present in the atmosphere. Even though it's too low to be lethal, most creatures will get sick for the first few months of their stay.


Gas mask insisted for outside environments,the atmosphere usually contains dangerous gases that can be lethal to most oxygen breathing creatures for prolonged exposure (e.g. a month)


Gas mask required in all areas, gases present in the atmosphere can kill within hours, if not sooner.


Full environment suit is mandatory, the atmosphere is lethal within minutes of exposure, and gas molecules can be absorbed through the skin.