Project. The primary objectives of this project were to explore the environments of Jupiter and Saturn, collect data regarding the outer heliosphere, and to investigate the nature of the asteroid belt that is located between the orbits of Jupiter and Mars. In order to accomplish these objectives, two spacecraft were built. Pioneer 10 and Pioneer 11, as they were named, were launched from the Earth on March 2, 1972 and March 3, 1973, respectively (Dyal 373). There have been other Pioneer missions, but