know more about Pluto.

Pluto, demoted from planet status in 2006, has been reclassified.It and other dwarf planets like it will be called plutoids. The International Astronomical Union(IAU) gave a full definition of what counts as a plutoid.
  A plutoid is defined as atype of dwarf planets that orbits the sun at a distance greater the Neptune an dhas enough mass for its self-gravity to give it a near-spherical shape.
  The two known and named plutoids are Pluto and Eris.The organization expects more plutoids will be found.Another dwarf planet,Ceres,does not merit the plutoid designation because it is the asteroid belt between Mars and Jupiter.