The author's previous flights into space reached the stars in the Standard Catalog. (The Conquest of Space- 1959 and Rockets, Missiles and Space Travel.) This should be a natural for the same sort of reception, because Mr. Ley's sure touch in organizing and explaining the abundant (and incomprehensible) data surrounding man's efforts in space is particularly apparent here. His tone is that of serious conversation. His definitions and explanations never smack of the pedantic. The purpose of the book is ""to point out in what areas of living the influence of the space sciences is likely to be felt first and to show that space scientists have been aware of these potential developments for a number of years"". Co-equal with this purpose is the author's successful attempt to show that space research is not for military purposes alone. These aims are accomplished with brevity as Ley moves from orbits and rockets to satellites, communication systems and present research. The last two chapters give the reasons for the man-in-space capsule flights and the by-products of space research.