 He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as "Nature" as well as other publications, including "The New York Times", "Sky & Telescope", and "New Scientist".He has appeared on the History Channel's "The Universe", Science Channel's "Through the Wormhole with Morgan Freeman", "Closer to Truth" (broadcast on PBS), and Comedy Central's "The Colbert Report".Carroll is the author of "Spacetime And Geometry", a graduate-level textbook in general relativity, and has also recorded lectures for The Great Courses on cosmology, the physics of time, and the Higgs boson.