A translation from German of a 1929 treatise by the author. Deals with the problem of the space travel. Expresses ideas about rocketry and space travel. Extensi

On November 29-30, 2018, in Washington, D.C., the National Academies of Sciences, Engineering, and Medicine held the Workshop on the Continuous Improvement of N

Space-based observations have transformed our understanding of Earth, its environment, the solar system and the universe at large. During past decades, driven b