FILE - In this July 15, 1961 file photo, Major Yuri Gagarin, the Russian astronaut, waves his greeting to spectators as he leaves the Soviet Embassy in London, United Kingdom, after his visit to Britain. He was mobbed by hundreds of onlookers and well-wishers as he drove from the embassy to London airport. The successful one-orbit flight on April 12, 1961 made the 27-year-old Gagarin a national hero and cemented Soviet supremacy in space until the United States put a man on the moon more than eight years later. (AP Photo/Dennis Lee Royle, File)