Neil: I don't know of any other branch of science that checks with the public on its definitions. Why don't we have a classification system that uses six-word definitions encompassing factors like shape, place, dynamic...
Sara: That's where things are headed.
Alan: 50 years from now you'll have a lot more variety in terms. That's what science does, it brings in new facts and doesn't object. The problem in Prague (where the Pluto debate happened) is people wanted to limit the planets. One guy objected saying his daughter couldn't memorize the names of 50 planets.
Neil: Maybe in the next century, as we get a closer look at these objects, we'll merge terrestrial and exoplanet fields and have a whole new way of seeing these issues.
That's it! The end of a great debate that shows how word choices have literally altered the course of exploration of the universe, and will continue to vex even the brightest minds on this planet. Great show, AMNH. See you at the 10th annual debate. If you want more, check out Neil deGrasse Tyson's book, The Pluto Files.