Retrorocket
（重定向自Braking rocket）
![Soyuz space capsule retro-rockets cushion the landing impact](/Images/godic/202501/01/Expedition_23_Landing3653.jpg")
![Descent of a martian lander halted by retrorockets. (computer generated impression)](/Images/godic/202501/01/Rocket_assisted_descent3653.jpg")
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 in the 2010s for retro-thrust rockets in reusable launch systems.