For a book about getting to the nearest star and back again, quickly, this has its fascinating theories and though we are far from being physicists at this end of the line, they caused us some moments of absorbed pondering. To put it briefly, new developments on the theory of relativity have, by the year 2150, shown the promise of enabling men like Hansman and Salter (and their space-cadet sons and families) to think about going to Alpha Centauri and its possible planets, at several times the speed of light. They liken their process to that of a ""dwarf star"" which creates its own dimension. So will their space ship create its own dimension, pulling space in around it to make a space hole within which they will travel at a speed that gets them there, with adventures, and back again, in three months. Well done.