Claim: The term cosmonaautics was first introduced in the book Initiation à la Cosmonautique by Ary Stternfeld in the 1930s, where the restrictions of mass, temperatures, and external forces require that applications in space survive extreme conditions: high-grade vacuum, the radiation bombardment of interplanetary space and the magnetic belts of low Earth orbit.
Evidence: The term cosmonautics (originally cosmonautique in French) was introduced in 1930s by Ary Sternfeld with his book Initiation à la Cosmonautique (Introduction to cosmonautics) (the book brought him the Prix REP-Hirsch, later known as the Prix d'Astronautique, of the French Astronomical Society in 1934.) As with aeronautics, the restrictions of mass, temperatures, and external forces require that applications in space survive extreme conditions: high-grade vacuum, the radiation bombardment of interplanetary space and the magnetic belts of low Earth orbit.