In 2006, Pluton was famous for being demoted from a planet to a dwarf planet. It remains today’s most famous dwarf planet, but there are others in our solar system, including hundreds of potentially undiscovered.
But exactly what is the dwarf planet? And how many d-star planets are there?
The planets of war are smaller than planets, but larger than asteroids and other small rocks in the solar system. They are not planets. Because they only meet two of the three criteria for something in the universe to be considered a true planet.
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Planets are defined in three qualities. It orbits the sun, mostly round, with gravity getting so large that it almost kicks a large object from its orbit. Uto Pun and other known dwarf planets meet the first two criteria, but the third is not because they orbit in Kuiper Belt, an area beyond Neptune filled with small pieces of ice.
When Pluto was first discovered in 1930, IT (and other similar objects in Kuiper Belt) were far apart and really difficult to find, even the most powerful telescope of the time. Certainly, the very qualities that make something into a planet of the war star make those objects particularly difficult to detect.
Related: James Webb Telescope discovers the “new kind of climate” of Pluto, unlike the rest of the solar system
“There are a few things that oppose us,” UCLA astronomer Mathew Yu told Live Science via email. “They are far from the sun. As a result, the reflected light becomes faint. Some people have low reflectivity, and they pretend to be light.”
He added, “They move slowly through the sky for distance from the sun.” “They circumference around the sun every few hundred years. Therefore, their relative movement to the stars in the background is small. For astronomers with limited observation times, these objects are difficult to detect.”
Astronomers found much better objects in the Kuiper Belt in the 1990s and 2000s as telescope technology improved. And once they got a little better, they noticed there were many rocks out there with orbits similar to Pltune. Between 2002 and 2005, astronomers discovered seven particularly large rocks: Haumea, Makemake, Quaaar, Sedna, Orcus, Eris and Salacia.
The International Astronomical Union (IAU) – a group of astronomers who decide by official names and terms of things in the universe – decided in 2006 that a new category was needed to explain these objects that are not large enough to clear orbits like true planets. Therefore, the name “Dwarf Planet” was born.
How many dwarf planets are there?
You might think that Kuiper Belt has a large rock with eight names, so it means that there are eight war stars. However, not all astronomers agree with this number.
“The accepted numbers range from around 10 to hundreds on the Kuiper Belt alone,” Yu said. “Some people are estimated to have a maximum of tens of thousands of people near the Kuiper Belt.”
The IAU officially recognizes only five dwarf planets of Kuiper Belt: Pltune, Haumea, Makemake, Eris, and Ceres in the asteroid belt. Only two of these sent space probes.
However, astronomers observing dwarf planets tend to recognize nine. Gonggon was discovered in 2007 after the dwarf planet’s name was changed, but was not confirmed until several new observations from the NASA telescope in 2016.
Although proposed, there are at least more objects that require more observations to check their size, therefore more objects and at least more.
And in June 2025, scientists proposed a new potential dwarf planet: 2017 of 201. Astronomers have found this particularly faint object by searching for piles of old data using new, advanced algorithms.
Count all of the currently proposed dwarf planets and newcomers and create more than 18 dwarf planets in the solar system. It’s just what we saw. As our telescopes are getting better, perhaps hundreds or thousands of people will be revealed one day.
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