Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In spaceflight, a booster may be: An entire launch vehicle or "launcher" used to lift a spacecraft. Initially all boosters used for human spaceflight and most unmanned boosters used liquid propellant, at least for the core launch vehicle. A strap-on rocket, (either a solid rocket booster or liquid rocket booster) used to augment the lift capability of a core launch vehicle

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