The Solar System
In the opinion of the International Astronomical Union at the time of writing, the Solar system consists of eight planets and their respective moons, five dwarf planets, an asteroid belt, a sun, and numerous outlying icy objects. Many people still consider one of the dwarf planets, Pluto, to be a true planet because it was counted as such for seventy years (and was the only one discovered by an American…) but the problem with this definition is that a more recently discovered and more distant planetoid, Eris, is larger than Pluto.
Our solar system is home to the planet Earth, the only known planet in the system hosting lifeforms which consider themselves intellegent. The other planets' lifeforms are far more modest.
As the general application of the term 'solar system' is based around a sun, and as each star visible from Earth (which are only a fraction of the total stars present in the universe), is a form of sun, there are many, many, many solar systems out there besides ours. This fact has been known to blow people's minds.
Summary of the current IAU definitions to clear up all this editing bollocks
True planets in order of distance from the sun
Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
Dwarf planets in order of distance from the sun
Ceres (briefly classed as a true planet in the early 1800s)
Pluto (classed as a true planet 1930-2006)
Haumea
Makemake
Eris