The Skylab 4 mission, which was the final crewed flight to the Skylab space station, lasted for 84 days, demonstrating the potential for long-duration missions in space. Launched on November 16, 1973, the mission's crew consisted of Charles Duke, Gerald Carr, and Edward Gibson. The astronauts focused on a variety of scientific experiments, notably in areas such as solar physics and the study of human endurance in a microgravity environment. Their work included critical observations of solar flares and lengthy research on the physiological effects of living in space for extended periods.

One of the fascinating aspects of Skylab 4 was its role in assessing the psychological effects of long-duration space missions. The crew faced both the challenges of isolation and the stresses associated with being confined in a spacecraft. Their successful management of these conditions provided valuable insights into future missions, particularly in preparation for longer journeys, such as those planned for Mars and beyond.

Upon returning to Earth on February 8, 1974, the crew landed in the Pacific Ocean, successfully concluding the mission which had done much to advance the understanding of human endurance in space. The mission not only contributed to scientific knowledge but also served as a test case for future long-duration missions. Each member of the crew left a significant mark on the legacy of human space exploration, highlighting the importance of preparing for extended time away from Earth.