Editing Retrorocket (section)

{{short description|Rocket engine providing negative thrust used to slow the motion of an aerospace vehicle}}
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{{original research|date=June 2013}}
{{more footnotes|date=June 2013}}
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[[File:Rocket assisted descent.jpg|right|thumb|Descent of a Martian lander halted by retrorockets (computer-generated impression)]]
[[File:Expedition 23 Landing.jpg|thumb|[[Soyuz (spacecraft)|Soyuz]] space capsule retro-rockets cushion the landing impact]]
A '''retrorocket''' (short for ''retrograde rocket'') is a [[rocket engine]] providing [[thrust]] opposing the motion of a vehicle, thereby causing it to decelerate. They have mostly been used in [[spacecraft]], with more limited use in short-runway aircraft landing.  New uses are emerging since 2010 for retro-thrust rockets in [[reusable launch system]]s.