staging

Staging is a crucial technique in spaceflight that allows rockets to achieve the necessary speed for orbit. Launch vehicles use multiple rocket systems stacked in sequence. The first stage ignites, propelling the rocket upwards until its fuel is depleted. This stage then detaches, reducing the vehicle's weight. Subsequently, the second stage ignites, further accelerating the remaining rocket. This process of dropping stages and igniting new ones continues until the payload reaches orbital velocity.12

Some missions reserve the final stage for a later phase, using earlier stages to reach a temporary "parking orbit" before the final stage boosts the spacecraft higher or away from Earth. While early rockets sometimes required five stages, most modern launch vehicles utilize two. The development of single-stage-to-orbit technology remains an ongoing area of research.1