Neil deGrasse Tyson's Case Against Pluto's 'Planet-hood' | Video
Tuesday, July 14, 2015 - 19:30
in Astronomy & Space
He calls himself an "accessory" to the demotion of Pluto in an interview with NBCNews' Lester Holt. Tyson uses Pluto's mass and its orbit crossing with that of Neptune as two major sticking point for classifying it as a dwarf planet.