In this episode, Scientific American editor George Musser explains recent research that could mean that the entire universe is 15 percent bigger and about two billion years older than previously thought. Plus, Pluto expert and MIT professor Richard Binzel, a member of the Planet Definition Committee of the International Astronomical Union, discusses the status of Pluto. And amateur astronomer and Plutophile Ari Mirsky shares his thoughts. Plus, we'll test your knowledge about some recent science in the news. Websites mentioned on this episode include, and