Pluto was discovered in 1930 by Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona. At the time Pluto became the ninth planet in our solar system. In August of 2006 less than 5% of the world's astronomers voted on a new definition of planet which outlined three criteria for planets.

1. It is in orbit around the sun

2. It is large enough to create it's own gravitational pull

3. It has cleared the 'neighborhood' around it.

Pluto lost planet status because of the third criteria. The 1992 discovery of the Kuiper belt items showed that Pluto had not cleared it's area. 

 I think that with new information and photographs being sent from New Horizons the definition of planet should be reconsidered to allow Pluto planet status again. I think the third stipulation was an arbitrary addition and should be amended.