Cosmonaut Andriyan Nikolayev born 1929

Cosmonaut Andriyan Nikolayev, born September 5, 1929 in the former Soviet Union, went into space twice. 

His first mission was aboard Vostok 3, a solo flight during which he spent 4 days in space in August 1962.

His second mission was aboard Soyuz 9 as commander in June 1970. He spent 17 days in space with fellow cosmonaut Vitaly Sevastyanov.

He passed away from a heart attack in 2004.

Vostok 4 launched 1962

August 12, 1962, cosmonaut Pavel Popovich blasted off in Vostok 4, just one day after Andriyan Nikolayev launched in Vostok 3.  Having two men in space in different spacecraft at the same time was a huge step for the Soviets in the space race.

Popovich stayed in space just under 3 days, orbiting Earth 48 times.  His flight was terminated early when a misunderstanding by ground control who thought Popovich used a codeword asking to end his flight ahead of schedule.

He landed about 7 minutes after Nikolayev and about 200km away.  Like Nikolayev, Popovich ejected from his spacecraft and parachuted to Earth separately.

Vostok 3 launched 1962

To further test the effect of microgravity on the human body, Vostok 3, carrying cosmonaut Andriyan Nikolayev, was launched August 11, 1962.   Nikolayev spent 4 days in space orbiting Earth 64 times before returning August 15. During his first day in space, Nikolayev unstrapped himself from his seat and floated freely, the first time a human had done this.

August 15, Nikolayev, the third cosmonaut in space, returned to Earth but he ejected from the spacecraft and landed separately.