The fuel is monomethylhydrazine(MMT) and the oxidizer is N2O4.

Liquid Oxygen and liquid hydrogen in the fuel tank. The orbiter uses Monomethylhydrazine (MMH) and Nitrogen tetroxide or peroxide(N2o4).
For takeoff the shuttle uses a hydrogen/ oxygen mixture. In orbit it uses a solid mixture of powdered aluminum and ammonium perchlorate


All current spacecraft use chemical rockets (bipropellant or solid-fuel) for launch
Liquid O2

There are two three types of fuel used in rockets

1) Solid fuel - an aluminum powder used for an initial boost into space.

2) Liquid fuel - usually super-cold liquid hydrogen and oxygen is used is the Space Shuttle's main engines during launch.

3) Hypergolic fuel - Monomethylhydrazine and Nitrogen Tetroxide does not need a source of ignition. It is mainly used for maneuvering in space.

Many different fuels can be used on such a trip. Especially for different purposes and phases of the flight.

For example on the Apollo missions to the moon, the Saturn V rocket used kerosene as fuel on the first stage and cryogenic liquid hydrogen on the upper 2 stages, the service module used monomethylhydrazine as fuel, the lunar module used aerozine 50 as fuel for both descent and assent stages.

Both stages of the Titan II rocket used Aerozine-50 (a combination of 50% UDMH [unsymmetric dimethylhydrazine] and 50% MMH (monomethylhydrazine) as the fuel, and dinitrogen tetroxide as the oxidizer.

Interestingly, the LR-87 engines that powered the first stage of Titan II, as well as the LR-91 engine that powered the second stage, were both also capable of burning two other combinations of propellant - LH2 (liquid hydrogen) and LOX (liquid oxygen) as well as RP-1 (kerosene) and LOX.