Mar 09, 1977
Season 4 Episode 8
Since its discovery in 1930, Pluto has held a warm place in the public imagination. So, 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-a firestorm led by angry, Pluto-loving elementary school students. But what is it about this cold, distant rock that captures so many hearts?