Skylab

Skylab. It was the first United States space station, launched and operated by NASA and occupied for about 24 weeks between May 1973 and February 1974. The program proved that humans could live and work in space for extended periods and conducted hundreds of experiments in solar astronomy, Earth observation, and biomedical research. Its eventual uncontrolled re-entry over the Indian Ocean and parts of Western Australia in 1979 became a worldwide media event.

Overview

Conceived in the late 1960s, the program utilized hardware originally developed for the Apollo program, most notably repurposing a Saturn V third stage as the primary workshop. Managed by the Marshall Space Flight Center under the direction of figures like Kurt H. Debus, its primary objectives were long-duration human spaceflight and scientific research. The station hosted three successive three-astronaut crews, delivered by Apollo Command/Service Module spacecraft launched atop smaller Saturn IB rockets. Key scientific instruments included the Apollo Telescope Mount, a sophisticated solar observatory, and experiments designed by institutions like the Naval Research Laboratory.

Design and development

The station's core was the Orbital Workshop, a converted S-IVB stage from the Saturn V rocket, which provided a large living and working volume. Major components were the Multiple Docking Adapter, the Apollo Telescope Mount, and an airlock module. Development was led by McDonnell Douglas as the prime contractor, with significant contributions from Martin Marietta for the ATM and North American Rockwell for integration. The design emphasized the use of existing Apollo Applications Program hardware to control costs, featuring a large solar array wing and a fixed micrometeoroid shield. Ground testing took place at facilities like the John F. Kennedy Space Center and the Manned Spacecraft Center.

Launch and initial problems

The unmanned station was launched on May 14, 1973, from Launch Complex 39A at Kennedy Space Center. During ascent, the critical micrometeoroid shield and one of the two main solar array wings were torn off, while the remaining wing was jammed. This left the station severely underpowered and exposed to intense solar heating, threatening the mission. The first crew, Pete Conrad, Paul J. Weitz, and Joseph P. Kerwin, launched 11 days later on a Saturn IB in an Apollo CSM. They performed a daring spacewalk to deploy the stuck solar array and erected a makeshift sunshade, saving the station. This first mission, known as Skylab 2, turned a potential failure into a major success for NASA.

Operational history

Three manned missions occupied the station: Skylab 2 (28 days), Skylab 3 (59 days), and Skylab 4 (84 days). Crews included astronauts like Alan Bean, Owen Garriott, Gerald Carr, Edward Gibson, and William Pogue. They conducted extensive research, including over 300 experiments. The Apollo Telescope Mount provided unprecedented observations of the Sun, capturing data on events like solar flares and the solar corona. Crews also performed detailed Earth resources experiment package surveys and critical studies on human adaptation to spaceflight, monitoring effects such as space adaptation syndrome and bone density loss. The final crew set a human spaceflight endurance record that stood until the Salyut 6 missions.

Legacy and impact

The program demonstrated the feasibility of prolonged human operations in space, providing crucial data for future programs like the Space Shuttle and the International Space Station. Its vast scientific archive, particularly in solar physics, remained valuable for decades. The successful in-orbit repair set a critical precedent for subsequent missions such as STS-61 to the Hubble Space Telescope. Debris from its highly publicized re-entry over the Shire of Esperance in Australia was collected and analyzed, informing orbital debris models. Artifacts from the station are displayed at institutions including the National Air and Space Museum and the U.S. Space & Rocket Center, cementing its place in the history of NASA. Category:Space stations Category:NASA space stations Category:1973 in spaceflight Category:1979 in spaceflight