WHY PLUTO IS NO A PLANET??
~   Until recently, Pluto was the ninth planet from the Sun. It was also the smallest planet.
Poor Pluto. Just how did he get "kicked out" of our family of planets?
And who are his "real" family members? Astronomers have already named three other objects in the solar system that are about the same small size as Pluto. They are Ceres [SEAR-ees], Makemake (MAH-kee-MAH-kee], and Eris (AIR-iss]. These objects, along with Pluto, are much smaller than the "other" planets.
Drawing of solar system, showing all planets, the asteroid belt, and the Kuiper Belt, with Pluto and other dwarf planets labeled. Ceres orbits in the Asteroid Belt between Mars and Jupiter. Makemake, like Pluto, is part of the "Kuiper [KI-per] Belt," which is a region of trillions of icy objects orbiting beyond Neptune. Eris' orbit is even farther out.
Astronomers have put these objects into a new family called dwarf planets.
Artist's rendering of all dwarf planets, including Pluto, Makemake, Eris, Ceres, and Earth's Moon, called Luna.
This picture shows the sizes of dwarf planets Pluto, Ceres, Eris, and Makemake as compared to Earth and Earth's Moon, here called "Luna." None of the distances between objects are to scale.~

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