Cosmic quandaries

A renowned astrophysicist explains the allure of Pluto, and the public outrage over its recent demotion from planet status.

Guests

• Neil deGrasse Tyson: Director of the Hayden Planetarium and has served on NASA's advisory council. His new book is "The Pluto Files: The Rise and Fall of America's Favorite Planet."

More from MPR

• Black holes, killer asteroids and why Pluto wasn't a planet
  March 16, 2007
• Pluto's demotion
  August 25, 2006
• Solar system may grow to 12 planets
  August 16, 2006

Resources

• About Neil deGrasseTyson