This is a combination of fuel and oxidizer used in rocket engines to supply thrust. NASA currently uses four types of propellants.
   Petroleum - RP-1 (refined petroleum) is a very pure form of kerosene, and used as a propellant in the first stage boosters of several rockets. Cryogenic - Liquid oxygen (LOX) is the oxidizer and burned with liquid hydrogen (LH2), which is the fuel.
   Hypergolic - These propellants are fuels and oxidizers that ignite on contact with each other, and need no other ignition source. The fuel is monomethyl hydrazine (MMH) and the oxidizer is nitrogen tetroxide (N2O4).
   Solid - Solid propellants motors are the oldest and simplest type of rocket engines. They burn solid chemicals at a rapid rate, expelling hot gases from a nozzle to achieve thrust.
   However, unlike liquid propellants, solid rocket fuel can't be shut off once ignited.

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