3 main liquid fuel engines, 2 solid-stage rocket boosters, and 25 compressed gas thrusters for maneuvering.
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The Space Shuttle main engines are powered by a combination of Liquid Oxygen (LOX) as an oxidizer and Liquid Hydrogen (LH2) as a fuel. Both propellants are stored in the space shuttle's External Tank during launch. They are fed into the space shuttle's main engines by umbilical lines on the external tank, and then the orbiter's main propulsion system feed lines. The Space Shuttle's main engines can achieve a thrust level of about 512,300 pounds, which is greater than 12,000,000 horsepower.
liquid because ir never runs out <3
It is supplied by tanks, which are filled with liquid hydrogen and oxygen before the shuttle is launched.
The Space Shuttle Main Engines (SSMEs) also known as the RS-24 engines are liquid fueled reusable engines made by Rocketdyne and burn liquid hydrogen as their fuel and liquid oxygen as the oxidiser. The shuttle has three engines. The fuel is stored in the large orange External Tank strapped to the shuttle's belly. On the way to orbit, the shuttle also uses two reusable solid rocket boosters (SRBs) which provide about 83% of the takeoff thrust. These use a solid fuel containing aluminum (the fuel), ammonium perchlorate (the oxidiser), iron oxide (a catalyst), and the mixture is held together with an epoxy and a binder (which also acts as fuel). While in space, the shuttle uses the reaction control system (RCS) thrusters which are seen on various places on the shuttle orbiter, and two orbital manoeuvering system (OMS) engines. The RCS and OMS use monomethyl hydrazine as the fuel and nitrogen tetroxide as the oxidiser.
There are actually two types of boosters that were both used by the space shuttle before their decommission. To propel the vehicle out into space from the surface of the earth out past the atmosphere, the shuttle used SRB's, or Solid Rocket Boosters. The engines on the actual shuttle are LRB's, or Liquid Rocket Boosters. These are used to propel the space vehicle further into space and into orbit around the earth.