Dreams before hardware
The idea of a permanent outpost in orbit is older than spaceflight itself. Writers and engineers such as Konstantin Tsiolkovsky, Hermann Oberth and, later, Wernher von Braun described wheels, rings and platforms in orbit well before any rocket could reach space. These were concepts on paper, not designs that anyone could build at the time.
The real thing had to wait for the space age. After the Sputnik launch of 1957 and the first human flights in 1961, the question shifted from whether people could orbit to how long they could stay.
Salyut 1: the first station
The first space station to reach orbit was the Soviet Salyut 1, launched on April 19, 1971. It was a single module, and it was visited by crews arriving in Soyuz spacecraft. Its first intended visitors, the Soyuz 10 crew, reached the station but could not complete a successful docking transfer and did not enter it.
The Soyuz 11 crew of Georgy Dobrovolsky, Vladislav Volkov and Viktor Patsayev docked in June 1971 and spent about three weeks aboard, which set a duration record at the time. They died during the return on June 30, 1971, when the capsule lost pressure before reentry. The crew were not wearing pressure suits, and later Soyuz flights were redesigned to carry suits for launch and landing. The station itself was later brought down in October 1971.
Stations followed the first artificial satellites, and they built on the same rocket and tracking experience that later gave the world communications satellites and weather satellites, though a station’s job was very different: to host people.
Salyut was not only a science project. A parallel Soviet program called Almaz was a military station, and some stations flown under the Salyut name were in fact Almaz designs. Historians still discuss how much each program was driven by science and how much by national competition.
Skylab: the American station
The United States launched Skylab on May 14, 1973. It was built from the upper stage of a Saturn V rocket, fitted out as a living and working space, and it was launched whole rather than assembled in orbit. It was far roomier than anything flown before, with separate areas for working, sleeping, and eating.
The launch went badly. A meteoroid and thermal shield tore away, taking one of the main solar arrays with it and jamming the other. The station overheated. The first crew, launched in May 1973, deployed a sunshade and freed the remaining array in a spacewalk, and the station became usable. Three crews visited in total, staying roughly 28, 59 and 84 days. The last of these was a record for American spaceflight at the time.
Skylab was not designed to be refueled or reboosted by a visiting vehicle in the way later stations were. After the program ended in early 1974, the station’s orbit slowly decayed, and it reentered the atmosphere in July 1979, with debris falling in the Indian Ocean and parts of Western Australia.
What crews did aboard
Early station crews had several jobs.
- Medical study. Doctors wanted to know how weightlessness affected the heart, muscles, bones and balance over weeks, not days. Crews exercised, were measured often, and acted as test subjects.
- Solar and Earth observation. Skylab carried a solar observatory, and Salyut stations carried telescopes and cameras. Earth photography became a regular activity.
- Materials and experiments. Some experiments tested how metals, crystals and fluids behave without gravity.
- Keeping the station running. Repairs, cleaning, and equipment checks took up a large share of the day.
Daily life was a lesson in its own right. Food, sleep, exercise and privacy all needed planning, and the early crews learned that schedules too tightly packed with work caused problems. Skylab planners, for example, adjusted workloads during the missions after crews reported being overscheduled.
Why the suits mattered
Stations also depended on clothing and equipment designed for the vacuum outside. Spacewalks to repair Skylab and to service instruments relied on suit technology developed in the preceding years, a story that begins with pressure suits for high-altitude pilots and continues through the Mercury suit and the lunar spacesuits.
Where the line leads
Later Soviet stations such as Salyut 6 and Salyut 7 added a second docking port, which allowed supply ships to arrive and crews to stay for months. That design approach fed into the Mir station and, eventually, the International Space Station. Power systems matter too: a fuel cell can supply electricity for a short mission, but a long stay depends on sunlight, and the idea of collecting solar power in orbit later inspired proposals for space-based solar power. Modern stations also depend on water recycling to reduce how much must be launched from Earth, and on solar panels for power, two themes that were already visible in the 1970s designs.
Claims about “the first station” depend on the definition. Salyut 1 was the first station to be launched and visited, while Skylab was the first American one, and both are properly part of the story.