What is the main function of a rocket in space missions?

The main function of a rocket in space missions is to transport payloads — such as satellites, spacecraft, or humans — from Earth’s surface into outer space. Rockets operate based on Newton’s third law of motion, expelling exhaust gases at high speed to generate thrust in the opposite direction. They overcome Earth’s gravitational pull, allowing spacecraft to reach orbit or travel to other celestial bodies. Rockets can be single-stage or multi-stage, depending on the mission. Besides launching satellites, rockets are essential for sending probes to planets, resupplying space stations, and advancing scientific exploration beyond Earth’s atmosphere.