Hermann Oberth is considered one of the most significant pioneers of rocket technology. His visionary work included not only a comprehensive and meticulous investigation and optimization of all conceivable rocket parameters but also his proposals for rocket instrumentation for manned and scientific missions, as well as ideas for launch and testing facilities. This new edition allows readers to trace the realization of Oberth's dream and compare it with today's spaceflight reality. Reprint of the 5th edition from 1984.