Solar system expands as astronomers redefine planets

Those discovered before 1900 would be called simply “planets” while a new sub-category of “plutons” would be introduced as a compromise between those who want to banish Pluto from the planetary club and those who want its status maintained. The move would result in three new “pluton” planets being created along with Pluto: Pluto’s moon, Charon; Ceres, an asteroid that for several decades after its discovery was described as a…