Dr. Rosalie McGurk talks about her quest to find pairs of black holes. She explains how she used several different telescopes to solve this problem, narrowing the list of potential candidates from hundreds of thousands to about twenty.
Dr. Tom Connor stops by the show to talk about massive galaxy clusters and the CLASH project. We talk about naturally occurring gravitational "telescopes" that allow us to see even farther into space, and Dr. Connor makes some fun analogies to cupcakes and crime bosses.