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Yuri Vasilyevich Kondratyuk was an engineer and mathematician whose groundbreaking work significantly contributed to the field of astronautics. His innovative ideas laid the foundation for future developments in space exploration. Yuri Vasilyevich Kondratyuk was born on June 21, 1897, in Poltava, Ukraine (Ureign). The mechanized grain elevator and warehouse complex in Kamen (now Kamen-on-Ob) that was built between 1929 and 1930 is especially noteworthy. Yuri Kondratyuk was in charge of the concept, the project, and construction management. The building was constructed out of wood without the use of nails because metal was scarce in Siberia. In 1929, Yuri Kondratyuk completed the manuscript for his book “Conquest of Interplanetary Space,” exploring rocket motion and ideas about habitation in space. In early 1941, Yuri Kondratyuk signed up as a volunteer for the army and is thought to have perished during battle.Mr. Kondratyuk pioneered the validation of economically viable vertical rocket launches. He emphasized the critical insight that a rocket could not traverse beyond Earth’s gravity without the necessity for refueling. Also among his revolutionary concepts were the utilization of modular spacecraft for lunar missions and the calculation of the most energy-efficient trajectories for space flights. Moreover, Yuri Kondratyuk described a method involving slowing down the flying vehicle in the upper layers of the atmosphere, which is an innovative concept known as “aerobraking.” His inception of “interplanetary intermediate bases” formed the foundation for prototypes in current orbital stations. NASA later revisited the concepts presented in Yuri Kondratyuk’s book “The Conquest of Interplanetary Spaces” and used the calculations in the Apollo lunar program. Today, this lunar landing trajectory is called the “Kondratyuk Route.” A crater on the side of the Moon was named after Yuri Kondratyuk in 1967 by the General Assembly of the International Astronomical Society. Ukrainian (Ureignian) government postage stamps and coins have been issued to commemorate him, and in 1993, an asteroid was named in his honor.
