Planets

Planets are celestial bodies that have the characteristics as follow:

• More than 800 km in diameter 
• Not too big as to cause thermonuclear fusion of deuterium in its core
• Have enough mass to have its own gravity
• Orbits around the stars or the remnants of stars
• Has been "clean environment" in the area around its orbit   

  Anyone know how many planets in this universe? 7? 8? 9? 10? or 11? The right are 8, according to the IAU (International Astronomical Union), want to know what are they? They are:

1. Mercury
2. Venus
3. earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune




Previously there are 9 planets with Pluto, but Pluto is right now not a planet anymore. Why? 
hmmm.... May be because Pluto is very small.

If not wrong recently add another planet to be 11, what are they?