The second sentence of this post is going to anger some of you.
Pluto is a dwarf planet, not a planet.
That thing that everyone is blogging and getting excited about? It came from a public debate about Pluto’s planetary status, followed by a vote. The people who voted, mostly folk in no way connected to astronomical sciences, voted that Pluto is a planet.
It’s like going to a TOS panel at a Trek convention and asking them to vote what the best series is. The results are not only weighted, but also entirely opinion.
See, Pluto’s status isn’t a matter of public opinion. It’s based on the IAU’s definition of what makes a planet a planet. And, as much as people want Pluto to be considered a planet, it isn’t. Neither are Ceres, Eris, Haumea, and Makemake.
I understand the nostalgic desire to call Pluto a planet, but this is a matter of science. Simply put, Pluto isn’t distinct enough from the other Kuiper Belt Objects to be thought of as a planet. And if it were, almost every asteroid in the solar system would be, too.