Of all the planets in our solar system, Saturn is probably the most striking, thanks to its dominant feature: a wide and complex ring system that stretches nearly 175,000 miles at its equator. In 1655, he discovered the planet’s first moon, Titan, and after four years of observation, published a treatise, Systema Saturnium, in 1659. The discoveries of the moons orbiting Jupiter and Saturn prompted considerable discussion amongst astronomers who had designated these bodies as planets. A Historical Journey through the Solar System, David A. Weintraub noted, “were all of these objects planets? As in the case with Jupiter, Saturn and its various moons proved to be an enticing destination for writers as science fiction established itself as a genre in the 1930s.