With Pluto demoted, this is now the outermost planet
The thought of a 
hidden planet larger than Earth is intriguing, but for now it's difficult to... [DOC] [TLE] Pluto - Overview | Planets - NASA Solar System Exploration [PAR] But after the discovery of similar intriguing worlds deeper in the distant Kuiper 
Belt, icy Pluto was reclassified as a dwarf planet.