50 years ago, Yuri Gagarin became the first man in space. But the unsung hero of the Soviet Union’s triumph was a brilliant scientist who survived Stalin’s purges It remains the one untarnished triumph of Soviet science. On 12 April 1961, a peasant farmer’s son with a winsome smile crammed himself into a capsule eight feet in diameter and was blasted into space on top of a rocket 20 storeys high. One hundred and eight minutes later, after making a single orbit of our world, the young pilot parachuted back to Earth. In doing so, Yuri Gagarin became the first human being to journey into space. The flight of Vostok 1 – whose 50th anniversary will be celebrated next month – was a defining moment of the 20th century and opened up the prospect of interplanetary travel for our species. It also made Gagarin an international star while his mission was hailed as clear proof of the superiority of communist technology. The 27-year-old cosmonaut became a figurehead for the Soviet Union and toured the world. He lunched with the Queen; was kissed by Gina Lollobrigida; and holidayed with the privileged in Crimea. Gagarin also received more than a million letters from fans across the world, an astonishing outpouring of global admiration – for he was not obvious star material. He was short and slightly built. Yet Gagarin possessed a smile “that lit up the darkness of the cold war”, as one writer put it, and had a natural grace that made him the best ambassador that the USSR ever had. Even his flaws seem oddly endearing by modern standards, his worst moment occurring when he gashed his head after leaping from a window to avoid his wife who had discovered a girl in his hotel room. To many Russians, Gagarin occupies the same emotional territory as John