Planets and Dwarf Planets

Once we were ignorant. Very. And we used the term planet. But there was no real definition for it. What was a planet?
Nobody knew.

Then we had trouble: some blokes discovered that some asteroids were MUCH larger than some of our solar system planets... so maybe they were planets? But there was a problem, they were too many. This would mean we would have to be adding planets yearly (new giant-asteroids are being discovered quite frequently) and that would turn out to be a mess.

And so the great minds of astronomy decided that we needed a proper definition, so that an actual unquestionable classification could be applied. And we might then be able to properly determine if one thing was a planet or not.
And so the term Dwarf Planet arose.

Now our system has 8 planets and an ever-increasing number of dwarf planets. Our current state is:

One sun: Sol (Which is Spanish/Portuguese por sun, but that's its name actually, very original.)
Four 'terrestial' Planets": Mercury, Venus, Earth and Mars (small solid ones).
The Asteroid Belt, in which there is a Dwarf Planet: Ceres.
The 'gas' Planets: Jupiter, Saturn, Uranus and Neptune (massive not-so-solid ones).
The Kuiper Belt with more Dwarf Planets: Pluto, Haumea, Makemake and Eris.
Three more possible Dwarf Planets: Sedna, Orcus and Quaoar (these are quite distant, so nobody's quite sure...)

So, that makes one star, eight planets, 8 dwarf planets (3 still disputed) and two belts made of tiny rocks. Awesome.

That pic shows the current state (not including Sedna, Orcus and Quaoar).

Enjoy yourselves.
Cheers.

PS: So, when people ask how our system is formed, an answer could be "one star, eight planets and a bunch of dwarf planets (which are like planets, but not quite.) How many? I don't think anybody knows..." Yeah, sounds about right.