The term Pioneer refers to a series of space missions launched by NASA in the 1970s, aimed at exploring the outer planets of our solar system. Notable missions include Pioneer 10 and Pioneer 11, which were the first spacecraft to travel through the asteroid belt and make close encounters with Jupiter and Saturn, respectively. These missions provided invaluable data about the planets and their moons, significantly enhancing our understanding of the solar system. The Pioneer spacecraft also carried the famous Pioneer Plaque, which serves as a message to potential extraterrestrial life, depicting human figures and our location in the galaxy.