Brave New Universe: Illuminating the Darkest Secrets of the Cosmos (with Paul Wesson)
The Great Beyond: Higher Dimensions, Parallel Universes and the Extraordinary Search for a Theory of Everything
Faraway Worlds: Planets Beyond Our Solar System
The Pursuit of Destiny: A History of Prediction
Countdown to Apocalypse: A Scientific Exploration of the End of the World
The Quest for Alien Planets: Exploring Worlds Outside the Solar System
The Structure of the Universe
The Cyclical Serpent: Prospects for an Ever-Repeating Universe
Cosmic Wormholes: The Search for Interstellar Shortcuts
Loecher im All (German version of Cosmic Wormholes)
Time Journeys: A Search for Cosmic Destiny and Meaning
Paul Halpern: Science Books and Articles
