Pluto has held a warm place in the hearts and imagination of many since
its discovery in 1930, but it is now at the center of a heated
scientific debate. Explore the rise and fall of America's favorite
planet with your students.
The Pluto Files
(Video)
Hear how the demotion of Pluto came about and the reasons behind it from
Neil deGrasse Tyson, the scientist who led the charge. (Chapter 2,
approx. 11 min.; Program available after broadcast)