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272 pages, Hardcover
First published December 7, 2010
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Here's that picture, with tiny Pluto in the right upper corner. A lovely flashback to childhood, thanks to the power of Internet.
鈥淧luto is not a planet not because it fails to meet the three-headed criteria laid out by the IAU. Pluto is not a planet because the criteria were written to try to explain the concept that Pluto is not a planet.鈥�I remember feeling annoyed with Pluto's demotion. Why mess up the beautiful picture of the solar system that my brain has been housing since the 1980s? It seemed silly and mean, and made me want to root for the underdog.
鈥淚鈥檓 still looking for planets, but the bar is now much higher. Anything new that wants to be called a planet needs to be a significant presence in our solar system, and I am not certain that there are any more hiding in the sky. But I keep going. Someday, I hope, I鈥檒l be sitting in my office looking at pictures of the sky from the night before, and there on the screen will be something farther away than I鈥檝e ever seen before, something big, maybe the size of Mars, maybe the size of the earth鈥攕omething significant. And I鈥檒l know. And, as I did years earlier, I鈥檒l immediately pick up the phone and call Diane. 鈥淕uess what?鈥� I鈥檒l say. 鈥淚 just found the ninth planet.鈥� And鈥攐nce again鈥攖he solar system will never be the same.鈥�