Foreword
THE following narrative offers as entertainment an introduction to the highly-interesting problems of the space flight plan. It is especially aimed at the reader who is not technically trained. The mathematical parts, however, are based on careful calculation. Of course, considerable time must still pass before we shall possess rocket ships so well constructed that we shall be able to venture a flight to a neighboring planet. The rocket ship will first have to stand its test on the earth. Yet it is well to keep the distant goal in sight, even if we are still just making a beginning toward it—
MAX VALIER