August 25, 2006O
n August 24, the International Astronomical Union
passed in what some consider a controversial vote to redefine the term planet. This resolution reclassified Pluto, long regarded as the 9th planet since its discovery in 1930, as a dwarf planet. In this week's podcast, planet hunter Mike Brown of Caltech, New Horizons Principal Investigator Alan Stern of Southwest Research Institute, and Patricia Tombaugh, widow of Pluto's discoverer, share their unique perspectives on the International Astronomical Union's resolution.