Booster (rocketry)
Rocket used to augment the thrust of a larger rocket / From Wikipedia, the free encyclopedia
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A booster is a rocket (or rocket engine) used either in the first stage of a multistage launch vehicle or in parallel with longer-burning sustainer rockets to augment the space vehicle's takeoff thrust and payload capability.[1][2] Boosters are traditionally necessary to launch spacecraft into low Earth orbit (absent a single-stage-to-orbit design), and are especially important for a space vehicle to go beyond Earth orbit.[citation needed] The booster is dropped to fall back to Earth once its fuel is expended, a point known as booster engine cut-off (BECO).[3]
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Following booster separation, the rest of the launch vehicle continues flight with its core or upper-stage engines. The booster may be recovered, refurbished and reused, as was the case of the steel casings used for the Space Shuttle Solid Rocket Boosters.[1]