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Tyson's new pbs nova documentary "the pluto files." dr. tyson is the guy who killed pluto. that is, it was dr. tyson and his team at the hayden planetarium at new york city who decided ten years ago to not call pluto a planet anymore and instead classify it as part of a distant asteroid belt. instead of remembering the planets by memorizing my very excellent mother just served us nine pizzas mercury veinous earth mars jupiter saturn uranus neptune pluto. you instead have to memorize my very excellent mother just served us nachos. no more pizza. no more pluto. for being the first physicist to r...

Streiter, illinois. thank you for being here. >> happy to be here. >> i want to start with the basics. what is a planet? [ laughter ] is there is an agreed upon definition for what a planet is? >> at this moment there is a voted upon definition that doesn't have full agreement by the entire community. but planet is big enough to be round. >> okay. >> and strong enough, if you will, to have completely -- almost completely cleared its orbit of other debris that could change its mass over time. so in other words, the big eight -- well, there is the big four, jupiter, saturn, and neptune. and plut...

But we think oh, it's the puny guy. we're americans. we like the underguy. >> that's okay too. if there is someone who is not favored to win a contest and they win you cheer them even harder and you're rooting for them. pluto was certainly the underdog, the puniest of the planets. now in its new zone, it's the largest of the icy bodies. it's the king of the comets. i think it's happier there. it's totally happier there. >> that was the exact same construction used to make the nerd guy cool in "16 candles." he got to be king of the nerds instead of the lowest. when you met with the family of th...

Latest updates on this topic from reliable sources.

Latest updates on this topic from reliable sources.