From the book reviews‎:‎ ‎"‎This is a readable‎,‎ insightful and personal history of interstellar travel thinking with a focus on propulsion ‎.‎‎.‎‎.‎ ‎.‎ each chapter has an ‎'‎introduction‎'‎ providing a short overview of the chapter while the ‎'‎practice exercises‎'‎ at the end are to stimulate discussion‎.‎ ‎.‎‎.‎‎.‎ The theoretical background presented here by Long deserves to be read and the bibliography deserves to be considered as a starting point for anyone interested in these topics‎.‎ The colour illustrations are very helpful‎.‎‎"‎ ‎(‎Anders Hansson‎,‎ The Aeronautical Journal‎,‎ November‎,‎ 2014‎)‎ ‎"‎Kelvin has taken the reader from the basic‎,‎ simple principles of reaction propulsion ‎.‎‎.‎‎.‎ and on to the exotic world of deep‎-space journeys‎.‎ ‎.‎‎.‎‎.‎ The most valuable aspect of this book is that it never bucks difficult issues ‎.‎‎.‎‎.‎ ‎.‎ If there is one book from which to gather all essential aspects of deep‎-space propulsion and stellar transportation systems this is it‎.‎ It is both required reading and an essential reference ‎.‎‎.‎‎.‎ ‎.‎ useful for the layreader and the profes‎.‎‎.‎‎.‎