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Soyuz (Russian: Союз, meaning "Union") is a series of spacecraft developed by Sergey Korolyov’s design bureau (today RKK Energiya) during the Soviet Union era and currently operated by the Russian Federal Space Agency (Roscosmos). Originally designed as part of the Soviet lunar program, Soyuz later became the primary vehicle for human spaceflight. It is regarded as one of the longest-serving and most reliable human spacecraft systems in history. History The development of the Soyuz spacecraft be