Self-sustenance

Self-sustenance is the ability to survive in environments that are generally considered to be hazardous. This may be a reflection of an individual's natural abilities, or may be derived through special adaptations indicative of their race, or may be provided through an external source such as a power armor, force field, etc.

Self-sustenance is but one of the many abilities afforded to those who wear a Green Lantern ring and are members of the Green Lantern Corps. The ring provides the wearer with a personal force field that enables them to survive and function in the vacuum of outer space.