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Booster Gold: Booster Gold is a fictional superhero appearing in American comic books published by DC Comics. Created by Dan Jurgens, the character first appeared in Booster Gold #1 (February 1986) and has been a member of the Justice League.
Booster (rocketry): A booster rocket is either the first stage of a multistage launch vehicle, or else a shorter-burning rocket used in parallel with longer-burning sustainer rockets to augment the space vehicle's takeoff thrust and payload capability. 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.
Booster engine: A booster engine for steam locomotives is a small two-cylinder steam engine back-gear-connected to the trailing truck axle on the locomotive or the lead truck on the tender. A rocking idler gear permits it to be put into operation by the driver .