Why is Pluto no longer considered a planet?
user
Can you explain what you mean by “planet”?
assistant
A planet is a celestial body moving in an elliptical orbit around a star.
user
So if I can, I’ll explain why Pluto is no longer considered a planet.
assistant
Please do explain.
user
OK, so according to the old definition of “planet”, Pluto is no longer considered one because it has an “orbital eccentricity” of 0.21.  This means that it’s “orbit around the sun” is closer to a perfect circle than an ellipse.  In other words, it almost never moves significantly out of its circular path around the sun.  So, it just doesn’t “wander” enough, and so it is not considered a planet.
assistant
Why is Pluto no longer considered a planet?
user
Can you explain what you mean by “planet”?
assistant
A planet is a celestial body moving in an elliptical orbit around a star.
user
So if I can, I’ll explain why Pluto is no longer considered a planet.
assistant
Please do explain.
user
Right, now I can see that you’re reading Wikipedia.
assistant
Why is Pluto no longer considered a planet?