In order for Pluto to be a planet, it has to fist be spherical(did I spell that right?) or rounded shape, OK, Pluto is round. A planet has to orbit the sun, that's good too. Now this is where they get all technical on you: In order for Pluto to be a planet, it has to control or dominate everything else around it.... FAIL! Pluto along with other mini planets don't control each other so... it is not a planet...
Earth's a planet because it is round, it orbits sun, and controls the moon. But note Pluto. Actually if you've been reading the science section, they found a couple of dwarf planets or mini's like Pluto but one is bigger but still doesn't qualify as a planet.
Ganymede, which is bigger than Pluto and Mercury can not be called a planet also. :(
It is because it also can not meet the requirements for a planet, it is defenitly big enough but it does not orbit the sun or controls everything near it. Why? It is because of Jupiter. Ganymede orbits Jupiter and it is controlled by Jupiter. Take Jupiter out and Ganymede could be a planet but, too bad. It's a moon.
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