Why is Pluto not a planet anymore?
Pluto has long been considered the 9th planet and the farthest away from the sun. But since the discovery of another body with a comparable size to Pluto beyond the orbit of Neptune, the classification of Pluto was reconsidered by the International Astronomical Union (IAU). Pluto is spherical and revolving around the sun, however it is not alone in the area and forms part of the Kuiper Belt where other dwarf planets like Haumea and Makemake have been discovered recently.
http://www.nasa.gov/mission_pages/newhorizons/main/
In 2006 NASA’s New Horizons took off for its long journey to Pluto. Credit: NASA
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