(Program not available for streaming.) When the American Museum of Natural History's Hayden Planetarium stopped calling Pluto a planet, director Neil deGrasse Tyson found himself at the center of a firestorm led by angry Pluto-loving elementary school students. What is it about Pluto—a cold, distant, icy rock—that captures so many hearts?

[Tyson] tackles a great range of subjects... With great humor, humility, and―most important― humanity.” ―Entertainment Weekly Loyal readers of.

Four years after the IAU (International Astronomical Union) officially reclassified the ninth planet as a plutoid, NOVA travels cross-country with Tyson to find out. The Pluto Files PBS Airdate: March 2, 2010 NEIL DEGRASSE TYSON (American Museum of Natural History, Hayden Planetarium): In 1930, a farm boy, with a passion for the universe, notices a tiny dot moving across the night sky.

He discovers Pluto, four billion miles from the Sun and cloaked in darkness. Pluto is a mystery. Our best images are nothing more than a blur, and many scientists are arguing over whether it's even a planet. MARK SYKES (Planetary Science Institute): When we fly our spaceship to Pluto, we'll arrive at a round world. MARSDEN (Harvard-Smithsonian Center for Astrophysics): I'm able to use the word 'world,' if you like, but 'planet?' NEIL DEGRASSE TYSON: The scientific debate over Pluto has even caused a media frenzy.

STEPHEN COLBERT ( The Colbert Report/Film Clip from August 17, 2006): I'm sorry, I thought planets might be one of the constants in life. NEIL DEGRASSE TYSON: Pluto-lovers of America have taken to the streets. PROTESTORS (News Clip): Pluto forever! NEIL DEGRASSE TYSON: What is Pluto? A new mission to the far reaches of the solar system promises to answer this question and more. ALAN STERN (Southwest Research Institute): It's true first-time exploration. Pluto is going to be revealed in all of its glory.

NEIL DEGRASSE TYSON: Join me, Neil deGrasse Tyson, on a journey to explore America's favorite planet. TOMBAUGH FAMILY MEMBERS (A small group speaking simultaneously): Hi. NEIL DEGRASSE TYSON.and find out why some people are blaming Pluto's problems on me. SODY (Streator, Illinois Barber): So how do you feel about Pluto, Dr. NEIL DEGRASSE TYSON: These are The Pluto Files, next on NOVA. For more than 75 years, the great stage of our solar system had a familiar cast of characters, nine players in all. We even memorized their names: Mercury, Venus, Earth and Mars (the rocky planets), Jupiter, Saturn, Uranus and Neptune, (those gas giants), and all the way out at the very edge of the solar system, perhaps the most popular player of all, a lonely little misfit planet: Pluto.

But recently, Pluto lost its starring role, and some folks are blaming that on me. I, Neil deGrasse Tyson, director of the Hayden Planetarium, in New York City, have been accused of being a Pluto-hater. Back in 2000, when my colleagues and I were designing this place, instead of exhibiting Pluto here, with planets like Earth and Mars, or up there, with giants like Jupiter and Saturn, we decided to boldly go where no planetarium had gone before and put Pluto far, far away, all the way downstairs, with a group of newly discovered icy objects in the outer solar system. If you look hard enough you can find it, right here. Little did I know how much this decision would change my life. My troubles began with the astute observations of one young visitor.

BOY (Visitor to Hayden Planetarium ): I can't find Pluto! NEIL DEGRASSE TYSON.who, just my luck, was overheard by an off-duty journalist from the New York Times. He decides this is a great story, so he calls his Times colleague, science writer Kenneth Chang, and he's shocked.

KENNETH CHANG ( The New York Times): Well, I was looking for Pluto, and I couldn't find it. Driver Scheda Video Hp Proliant Ml110 G5. You look everywhere, and you see eight planets, not nine.