Beschreibung : Previous cover type. With Salyut 6, the Soviet space station program evolved from short-duration to long-duration stays. It was launched unmanned and crews arrived later in Soyuz spacecraft. It had two docking ports. This permitted refueling and resupply by automated Progress freighters derived from Soyuz. Progress docked automatically at the aft port, and was then opened and unlocked by cosmonauts on the station. Transfer of fuel to the station took place automatically under supervision from the ground. A second docking port also meant long-duration resident crews could receive visitors.

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SALYUT 6 · 2ND GEN OF SPACE STATION · LONG DURATION STAY