It was just about a year ago that the International Astronomical Union demoted Pluto from planet to dwarf planet. At the same time, two other solar system objects -Eris and Ceres- were upgraded from lower categories. Ceres, discovered in 1801, is the largest asteroid belt object, and is composed of a rocky mantle and icy crust. [...]
Filed under: Science | Tagged: Astronomy, Centaurs, Ceres, Eris, Kuiper Belt, Pluto, Solar System, Space | Leave a Comment »
