The content originally appeared on: CNN Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. CNN - 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. Born on April 27, 1942, the Russian cosmonaut lived and worked in space for a record 437 days in one stint - orbiting Earth aboard the […]
