Today from 1961 we celebrate the International Day of Human Space Flight - World Cosmonautics Day, when Yuri Gagarin circled the Earth for 1 hour and 48 minutes aboard the Vostok 1 spacecraft. (http://en.wikipedia.org/wiki/Cosmonautics_Day).
But one of the first steps to the stars was paved by Yuriy Vasilievich Kondratyuk (http://en.wikipedia.org/wiki/Yuri_Kondratyuk), who wrote in 1929 the book “The conquest of interplanetary space” without ANY special education! (http://www.amazon.com/conquest-interplanetary-space-Vasilevich-Kondratiuk/dp/590001102X)+( http://epizodsspace.no-ip.org/bibl/kondratuk/01.html – in *.pdf)+( http://sciencefirsthand.ru/pdf/sfh_37_64-75.pdf).
Yuri Kondratyuk Memorial Museum (http://www.russia-ic.com/culture_art/museums/1332/).
Yuri Kondratyuk Memorial Museum in Poltava (Ukraine) (http://welcome-to-poltava.com.ua/read/yuri_kondratyuk)
The name of our countryman Yuri Kondratyuk wrote with gold letters in the hall of fame Space Museum NASA in the U.S.