It has sometimes been assumed that Ceres was "re"classified as a dwarf planet, and that it is therefore no longer considered an asteroid. For example, a news update at Space.com spoke of "Pallas, the largest asteroid, and Ceres, the dwarf planet formerly classified as an asteroid", whereas an IAU question-and-answer posting states, "Ceres is (or now we can say it was) the largest asteroid", though it then speaks of "other asteroids" crossing Ceres' path and otherwise implies that Ceres is still considered an asteroid. The Gazetteer of Planetary Nomenclature at the IAU lists Ceres under 'Asteroids'. The Minor Planet Center notes that such bodies may have dual designations. The 2006 IAU decision that classified Ceres as a dwarf planet also implied that it is simultaneously an asteroid. It introduces the category of small Solar System body, as objects that are neither planets nor dwarf planets, and states that they 'currently include most of the Solar System asteroids'. The only object among the asteroids that would prevent "all" asteroids from being SSSBs is Ceres. Lang (2011) comments "the has added a new designation to Ceres, classifying it as a dwarf planet. ... By definition, Eris, Haumea, Makemake and Pluto, as well as the largest asteroid, 1 Ceres, are all dwarf planets", and describes it elsewhere as "the dwarf planet–asteroid 1 Ceres". NASA refers to Ceres as a dwarf planet, as do various academic textbooks. However, NASA has at least once referred to Vesta as the largest asteroid.