This has been such a contentious and controversial decision that I wouldn't worry about it that much. And if you had to RESEARCH it to find this out, you haven't been keeping up with the news!
http://www.cnn.com/2006/EDUCATION/08/25/pluto.reaction/index.html
It's common knowledge that astronomers no longer officially call Pluto a planet, so if you left it in, your editor would likely call you on it. So you gotta deal with it.
Just out of protest I might borrow from the artist once known as Prince and refer to it as "the heavenly body once known as the ninth planet of our Solar System." Or I might do something
even worse, "Pluto was officially demoted from Planethood in 2006, but was finally restored to its position as the Ninth Planet in the Solar System in 2019." I might even, with a touch of arrogance, say "rightful place" instead of "position."
The article talks about this name change being part of "science" but I'm a bit doubtful. Biology has (from what little I remember about it) well-organized classifications of species and such, so that most newly discovered living things can easily be put into a logical place based soley on their characteristics. The decision of whether or not Pluto is a planet seems more arbitrary - discussions the Astronomical Union may have had, such as how big a body has to bebe, what its orbit should be, etc. to be called a planet may have been more political than scientific.
I don't see it now, but there was a 15-20 minute youtube video of Richard Feynman talking on several topics. He spoke of a certain species bird and a man knew the name of the bird in 20 languages. Feynman pointed out that this was NOT knowledge about the bird, only knowledge about what different people called the bird. It didn't contribute to knowledge about the bird in any way.
This is a 49-minute video of Feynman, he goes into the above topic about 6-7 minutes into it:
http://video.google.com/videoplay?docid=6586235597476141009&q=richard+feynman&hl=en