The person who spent the most time in space, Russian cosmonaut Valery Vladimirovich Polyakov died last Monday (19), at the age of 80, announced Roscosmos, the Russian space agency.
A doctor, Polyakov made his first spaceflight in 1988 and until his retirement from spaceflight in 1995, he spent a total of 678 days in space. All aboard the former Soviet space station Mir.
His first mission lasted from August 29, 1988 to April 27, 1989. On his second mission, from January 8, 1994 to March 22, 1995, Polyakov volunteered for a medical experiment to study the effects of a long period of time in a microgravity environment for humans.
On occasion, the cosmonaut demonstrated the physical feasibility of long-duration spaceflight. After his retirement, Polyakov continued to be involved in the Russian space program, working on the qualification and selection of new Russian cosmonauts and dealing with the health aspects of space missions.