Written in the USSR in the autumn of 1957 and quickly translated into French, this popular science book introduces the general reader to the fundamental principles of astronautics. In eight chapters, Kaznevsky covers the age-old dream of space travel, the physics of planetary atmospheres, reaction engine mechanics, rocket launch techniques, scientific applications of artificial satellites, technical challenges, prospects for future rockets, and conditions for life in the solar system. Four appendices provide comparative charts on experimental rocket performance (A-4, Viking, Bumper) and a data table on the solar system's celestial bodies.