Rocket Propulsion: The system that provides the thrust to launch and propel a rocket or spacecraft, typically using a combination of fuel and oxidizer to generate thrust through the expulsion of hot exhaust gases.
Launch Vehicle: The rocket or spacecraft that carries the payload from the launch site into space, providing the necessary thrust and guidance to deliver the payload to its intended destination.
Orbital Mechanics: The study of the motion of objects in space, including the trajectories and orbits of satellites, spacecraft, and other celestial bodies, which is crucial for determining the optimal launch and delivery of payloads.