No, rockets typically do not have reverse-thrust systems. Unlike airplanes or other vehicles that operate in the Earth's atmosphere, rockets operate in the vacuum of space, where there is no air or significant resistance to oppose their motion.
Rockets work on the principle of Newton's third law of motion: for every action, there is an equal and opposite reaction. They propel themselves forward by expelling high-speed gases or exhaust out of their engines. The expulsion of gases in one direction generates an equal and opposite force that propels the rocket forward.
Once a rocket is in space and has achieved its desired velocity and trajectory, it generally does not need to decelerate or stop abruptly. The absence of significant atmospheric drag or resistance allows rockets to continue along their desired trajectory until they reach their destination, whether it's an orbit around Earth, a planetary destination, or beyond.
However, it's worth noting that some spacecraft and landers designed for planetary exploration, such as the Mars landers, may have thrusters or retro-rockets to provide controlled descent and landing. These thrusters are used to reduce the descent velocity and ensure a controlled landing. Once on the surface, these thrusters are not typically used for reverse-thrust, as the spacecraft generally doesn't need to take off again.
In summary, while rockets don't generally have reverse-thrust systems, specific spacecraft or landers may incorporate thrusters for controlled descent and landing purposes.