Leonov, who will turn 81 in May, was the first human to exit, float free and then reenter an orbiting spacecraft, during the Voskhod-2 spacecraft mission on March 18, 1965.
"Seven emergency situations happened during the flight, which had never been described anywhere. The most serious of them […] when the navigation system failed," Leonov told journalists.
50 years ago Russia cosmonaut Alexei Leonov became the first human to walk in space! pic.twitter.com/5lSXIc4blq— David Saint-Jacques (@Astro_DavidS) 18 Март 2015
The legendary space explorer attended the unveiling of Cosmonauts Alley in the city of Krasnogorsk near Moscow. A model of the Voskhod-2 is part of the new monument, installed at the site.
Leonov is also set to unveil a memorial stone, celebrating his extraterrestrial exploits, at the Star City space training facility.