premise: furthest / farthest means greatest / most / highest in distance sent2: as the distance of a planet from the star it orbits increases , the length of a planetary year on that planet will increase sent3: neptune is a kind of planet in the solar system sent4: planets in the solar system orbit the sun sent5: neptune is the planet that is furthest to the sun in the solar system.
hypothesis: neptune has the longest solar year / planetary year in the solar system