Valery Polyakov, record-breaking Russian cosmonaut, dead at 80

Cosmonaut Valery Vladimirovich Polyakov, who holds the record for the longest single stay in space, has died at age 80, Russian space agency Roscosmos announced Monday.

Valery Polyakov, record-breaking Russian cosmonaut, dead at 80
Cosmonaut Valery Vladimirovich Polyakov, who holds the record for the longest single stay in space, has died at age 80, Russian space agency Roscosmos announced Monday.