The planetary status of Pluto
Clip: Season 5 Episode 15 | 6m 11s | Video has closed captioning.
What makes a planet a planet? In 2006, the International Astronomical Union stripped Pluto of its planet status. Phillip Metzger, a planetary scientist at the University of Central Florida joins Hari Sreenivasan to discuss to the reasoning behind the reclassification of planets.
Problems Playing Video? | Closed Captioning