Why launch a spacecraft with a multi-stage rocket?

Multi-stage rockets are used to launch spacecraft, because multi-stage rockets throw away the structural mass that is no longer useful at regular intervals without consuming propellant. Therefore, as long as the propellant quality is increased and the rocket is properly divided into several stages, the rocket can finally reach a large enough carrying capacity. And with the gradual entry of human beings into deep space exploration, the spacecraft has more and more functions, which requires rockets to have greater carrying capacity, so multi-stage rockets have emerged.

Multi-stage rocket can throw away unnecessary mass after each stage of work, so it can obtain good acceleration performance and gradually reach the predetermined flight speed during the rocket flight.

The engines of multi-stage rockets work independently, and the engines can be designed according to the flight conditions of each stage to make the engines in the best working state, thus improving the flight performance of the rockets.

Multi-stage rockets can flexibly choose the thrust and working time of each stage to meet the requirements of launching orbit, orbit measurement and manned spacecraft flight overload.