English Beginner Black Holes and Time Warps: Einstein’s Outrageous Legacy Kip S. Thorne,Stephen Hawking 1995 View book
English Beginner Making Starships and Stargates: The Science of Interstellar Transport and Absurdly Benign Wormholes James F. Woodward 2012 View book
English Beginner Time travel in Einstein's universe: the physical possibilities of travel trough time Gott,J. Richard 2003;2002 View book