Why are their only nine planets in the solar system?

Question

Why couldn't there be ten instead of nine?

Answer 1

There are actually 8. Pluto was nuked quite some time ago; did you just arrive on this planet?

Answer 2

therez only 8. pluto ain't a planet

Answer 3

8 planets. Pluto has been 'disqualified' as a planet.

Answer 4

why do we have four fingers instead of three? or five?

Answer 5

There are actually only eight planets in the solar system (Pluto is no longer a planet).  The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Simply put, the definition of a planet (as decided by the International Astronomical Union) is

1. It has to orbit the sun

2. It has to be round

3. It has to have cleared out its space

There are only eight objects in our solar system that fit all of these classifications

Pluto is in the Kuiper belt.  The Kuiper belt is sort of like the asteroid belt.  Because there are many other objects in the Kuiper belt and the asteroid belt, objects within them have obviously not "cleared out their space".  Objects include Ceres (in the asteroid belt), Pluto, and Eris (a Kuiper belt object which is larger than Pluto).  These objects are classified as "dwarf planets".