Black Holes : A Traveler's Guide
In Search of the Edge of Time : Black Holes, White Holes, Wormholes
Cosmology and Astrophysics Through Problems
Revelations: Alien Contact and Human Deception
Black Holes, Wormholes & Time Machines
Planet Quest: The Epic Discovery of Alien Solar Systems
Adventures in Celestial Mechanics : A First Course in the Theory of Orbits
The Dream of Spaceflight : Essays on the Near Edge of Infinity
Celestial Encounters : The Orgins of Chaos and Stability
Feynman's Lost Lecture: The Motion of Planets Around the Sun
Aiming for the Stars: The Dreamers and Doers of the Space Age
Life on Other Worlds : The 20Th-Century Extraterrestrial Life Debate
Dark Matter, Missing Planets and New Comets : Paradoxes Resolved, Origins Illuminated
Mining the Sky : Untold Riches from the Asteroids, Comets, and Planets
Chesapeake Invader : Discovering America's Giant Meteorite Crater