S-IVB

The S-IVB was a type of rocket stage used in NASA's Apollo missions. It was a powerful, single-use segment that helped propel astronauts from Earth orbit toward the Moon. Made by Boeing, the S-IVB was filled with liquid fuel and used a powerful engine to give the spacecraft the extra boost needed for the critical trans-lunar injection—sending astronauts on their lunar journey. After its job was done, it either was sent into a safe orbit around the Sun or intentionally crashed into the Moon. The S-IVB played a vital role in making lunar exploration possible.