Methanogens are microorganisms known to live in oxygen depleted environments and produce methane as a by-product. Methanogens are archea and live in environments such as marshs, submarine hot springs (hydrothermal vents), and the human gastro-intestinal tract. Due to their ability to live in such extreme oxygen depleted environments, they have been given the pseudo-taxonomic name of “extremophiles.” The reasoning behind their name, and one of their main biological/metabolic features, is the attribute of giving off methane as a metabolic by-product. Because of their production of methane, or methanogenesis, and their ability to live in such extreme locations, the Genome of different types of Methanogens are under research in hopes of obtaining a better insight into their function. If better understanding of Methanogens is obtained, then this knowledge could very positively impact the fields of green-energy, and astrobiology in understanding how to harness the natural energy of methane, and how organisms may survive on other celestial bodies respectively.