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In the excellent video below, an explanation is provided as to why Pluto is not considered a planet anymore. It is quite a reasonable and articulate argument.
https://vimeo.com/85738666
I personally feel Pluto should have held on to its planet classification out of tradition, but the deed is done and there is no going back now. As NASA's New Horizons approaches the "dwarf planet" Pluto, and we get clearer and clearer images and data from the probe, I can't help but feel like a circle is being closed in my life.
When I was a young child, I used to read and reread an old picture book of the Solar System we had in our house. I was obsessed with the book and memorized its every detail. I learned about the Viking and Voyager Missions. I knew the order of the planets, their respective sizes, how Uranus spun on its side, how Venus was hotter than Mercury even though Mercury was closer to the Sun, etc. If anyone was careless enough to bring up the planets around the ten year old version of me, they were subjected to all these facts and more. It was my first real passion and it was my gateway drug for science.
To me, Pluto will always be a Planet. I can't help it. I can't betray that 10 year old that spent all that time memorizing the planets and their stats, dreaming about them drifting along in cold, empty space. Wondering when we would finally visit the rest of them, especially distant, lonely Pluto at the edge of everything. At the time there wasn't much information on Pluto and the book was filled with estimates and question marks where its stats should be. I stared at those question marks, trying to guess what they were. I was obsessed. I wanted to know. No, I needed to know!
As you would expect, I'm much more excited about New Horizons than I probably should be. After all, it's just a flyby of a Kuiper Belt object. A small, icy dwarf planet in a region filled with dwarf planets. Sure we'll have a better idea of what Pluto looks like and about its composition, but there isn't likely to be any huge discoveries. More like a filling in of the blanks. Still, for me it's important. if only because in July I will finally, after 30 years get to see the last of those question marks on Pluto's page filled in.
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