Worlds similar to Pluto were discovered in the region of our solar system known as the Kuiper Belt.
Pluto, famous for once being the ninth planet, was reclassified as a dwarf planet in 2006 after new information emerged about the outer reaches of our solar system.
PDT, NASA's New Horizons spacecraft sped past Pluto - a destination that took nearly nine and a half years to reach - and collected scientific data along with images of the dwarf planet.
