Philip Plait a renowned astronomer with more than two decades of professional research and education experience. He has written articles for such magazines as Astronomy and Sky & Telescope, as well as national and international newspapers. He has appeared on television news and in documentaries many times, including the Sci-Fi Channel's Countdown to Doomsday and National Geographic's Is It Real? His website Bad Astronomy has won numerous awards, such as best Science Blog of 2007, and also begat the book of the same name. Phil's latest book is Death From The Skies!

First broadcast on 12th December 2008.