I orbit beyond the orbit of Neptune (mostly). Some say I am not a Planet. Well I am. I even have my own Moon, just like the Earth. It is called Charon. Yes, I orbit different than the rest, but that does not mean that I am not worthy of the same rights as you. Just like some of you that walk or talk a little differently than the rest arent any less human. I am no less a Planet.
My Orbit: 5,913,520,000 km (39.5 AU) from the Sun (average)
My Diameter: 2274 km
My Mass: 1.27e22 kg
According to Roman mythology, Pluto (Greek: Hades) is the god of the underworld. I received this name (after many other unworthy suggestions) perhaps because I'm so far from the Sun that it is in perpetual darkness that I dwell. Others say that it is because "PL" are the initials of Percival Lowell, whose Observatory discovered me.
I was discovered in 1930 by accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune, based on the motions of Uranus and Neptune. Not knowing of the error, Clyde W. Tombaugh of the Lowell Observatory in Arizona did a very careful sky survey which showed me to exist. I am very greatfull to him.
After the discovery of me, it was quickly determined that I was much too small to account for the discrepancies in the orbits of the other planets. The search for Planet X continued but nothing was found. Nor is it likely that it ever will be: the discrepancies vanish if the mass of Neptune determined from the Voyager 2 encounter with Neptune is used. There is no Planet X. I am Planet X and my name is Pluto. But that doesn't mean there aren't other objects out there. There are many things out there, trust me... In fact, I now know that there are a very large number of small objects in the Kuiper Belt beyond the orbit of Neptune, some roughly the same size as me.
I hope you will be my freind and help me in my struggle for equality. Your planet is well known for being a fair and civil place that respects the rights of the individual and I appeal to you to spead the word... PLUTO IS A PLANET.