The Russian space agency Roscosmos has announced the death of “cosmonaut No 11” Alexei Leonov.
Leonov who was the first man to conduct a spacewalk in 1965, died in Moscow on Friday at the age of 85 after a long illness.
He was a close friend of Yury Gagarin, who became the first human to go to outer space in 1961.
Leonov made history when he left a spacecraft during the Voskhod 2 mission for a spacewalk that lasted 12 minutes and nine seconds.
The flight and spacewalk were successful on the whole but his return to Earth nearly ended in tragedy when he and another cosmonaut, Pavel Belyayev, crash-landed in the Siberian woods.
Leonov was decorated twice with the country’s top honour, the Hero of the Soviet Union.