Pluto's demotion was partially caused by us getting better at spotting planets (or "dwarf planets," if you prefer). In the early 2000s, astronomers identified Haumea, Eris, Makemake, and other ...

Gonggong is a dwarf planet and a member of the scattered disc beyond Neptune. As of 2019, its distance from the Sun is 88 AU, and it is the sixth-farthest known Solar System object.

"Pluto is additionally recognised as an important prototype of a new class of Trans-Neptunian Objects: plutoids." The other four dwarf planets in the solar system are Ceres, Haumea, Makemake and Eris.