How are dwarf planets unlike inner and outer planets?
If you mean “unlike our solar system’s inner and outer planets,” your question still does not make sense. You may be referring to “brown dwarfs,” which are would-be stars that never got enough mass to ignite. Planetoids or planetesimals are small bodies, usually irregular, not round, and much smaller than either inner or outer planets of our solar system. The outer planets are gas giants or frozen-atmosphere small planets. Pluto’s status is still a matter of debate. The International Astronomical Society decided it was not a planet, despite the fact that is is round and has a planet-like orbit. They concluded it was too small to be a planet. It is not called a dwarf planet.
