Monomethylhydrazine (MMH) is a volatile hydrazine chemical with the chemical formula CH3(NH)NH2. It is used as a rocket fuel in bipropellant rocket engines, and frequently in hypergolic mixtures. MMH is very commonly applied notably in the orbital maneuvering system (OMS) engines of NASA's Space Shuttle. This chemical is toxic and carcinogenic in small amounts, but it's easily stored in outer space providing moderate performance for very low fuel tank system weight. Recently the European Space… (More on Monomethylhydrazine)