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{{short description|Solid propellant motor used to augment the thrust of a rocket}}
[[File:SRB-Stardust.JPG|right|thumb|NASA Image of a solid rocket booster (right) being mated to a [[Delta II rocket]] (blue). Two boosters (white) can be seen already attached.]]
{{mergeto|Solid-propellant rocket|discuss=Talk:Solid-propellant rocket#Merger proposal|date=March 2020}}
'''Solid rocket booster''' ('''SRB''') is a large solid propellant motor used to provide [[thrust]] in spacecraft launches from initial launch through the first ascent Many launch vehicles, including the [[Ariane 5]], [[Atlas V]],<ref>{{citation|publisher=Lockheed Martin |section=Data |title=Assets |format=[[PDF]] |url=http://www.lockheedmartin.com/data/assets/13434.pdf |url-status=dead |archiveurl=https://web.archive.org/web/20111217084517/http://www.lockheedmartin.com/data/assets/13434.pdf |archivedate=December 17, 2011 }}</ref> and [[Space Shuttle]], have used SRBs to give launch vehicles much of the thrust required to place the vehicle into orbit. The Space Shuttle used two [[Space Shuttle Solid Rocket Booster|Space Shuttle SRBs]], which were the largest solid propellant motors ever built and the first designed for recovery and reuse.<ref>{{Cite web|title = HSF - The Shuttle|url = http://spaceflight.nasa.gov/shuttle/reference/shutref/srb/srb.html|website = spaceflight.nasa.gov|access-date = 2016-02-08}}</ref>
The propellant for each solid rocket motor on the Space Shuttle weighed approximately 500,000 kilograms.<ref name="science_ksc_nasa_gov-srb_html_srb">{{cite web | publisher = NASA | location = USA |title=Solid rocket boosters|url=http://science.ksc.nasa.gov/shuttle/technology/sts-newsref/srb.html#srb | date = 2009-08-09}}.</ref>
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