1973: Launch of Skylab, the United States' first orbital complex. This flight marked the final operational mission of the Saturn V heavy-lift launch vehicle. Designed as a multidisciplinary laboratory, Skylab generated fundamental data in human physiology (adaptation to microgravity), Earth remote sensing, and solar astrophysics via the Apollo Telescope Mount observatory. These results established the essential scientific protocols for the future development of the International Space Station (ISS).

Image credits : nasa.gov