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What is the fuel for the space shuttle?
In the past, the fuel of spacecraft was liquid hydrogen and liquid oxygen propellant, but now the fuel used by spacecraft is generally hydrazine and other normal temperature fuels. Hydrazine fuels generally refer to hydrazine, methylhydrazine and unsymmetrical dimethylhydrazine, which are widely used as aerospace and missile fuels because of their good energy performance.

Hydrazine fuel will spontaneously ignite when it comes into contact with many strong oxidants. With the increase of carbon atoms in hydrazine, the thermal stability is improved. UDMH is often combined with fuming nitric acid and nitrogen tetroxide to form two-component liquid propellant, which is widely used in various launch vehicles and strategic and tactical missiles. Hydrazine and methylhydrazine are commonly used in attitude control engines.