The exploration of which planet by the Pioneer and Voyager spacecraft is considered one of the greatest scientific achievements of the twentieth century?

The exploration of Saturn by the Pioneer and Voyager spacecraft is recognized as one of the monumental scientific achievements of the twentieth century due to the significant discoveries and data collected during their missions. The Voyager spacecraft, in particular, provided extensive information, revealing Saturn's complex ring system and its numerous moons. Noteworthy moons like Titan were explored, leading to the discovery of a thick atmosphere and surface lakes of methane, fundamentally changing our understanding of planetary systems. The detailed imaging and data analysis from these missions have greatly contributed to planetary science, fostering further explorations and studies of Saturn and its environment. These findings have had a lasting impact on our knowledge of the outer solar system and the processes that govern planetary bodies.