"In 2006, when the vote on the definition of "planet" was made, and the eight dominant bodies in the solar system were declared (quite rationally) a class separate from the others, a new class of objects was defined. The "dwarf planets" are all of those objects which are not one of the eight dominant bodies (Mercury through Neptune) yet still, at least in one way, resemble a planet. In other words, a dwarf planet is something that looks like a planet, but is not a planet. Specifically this means that dwarf planets are bodies... large enough to become round due to their own gravitational attraction...How many dwarf planets are there? Ceres is the only asteroid that is known to be round. After that it gets complicated. All of the rest of the new dwarf planets are in the distant... Kuiper belt, where we can't actually see them well enough to know for sure if they are round or not."
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"How many dwarf planets are there in the outer solar system? (updates daily)", By Mike Brown, Professor of Planetary Astronomy, CalTech.
https://en.wikiquote.org/wiki/Dwarf_planet
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