The Space Shuttle Endeavour embarked on mission STS-77 with the primary aim of deploying several satellites and conducting a variety of scientific experiments in space. Launched from the Kennedy Space Center in Florida, this mission was particularly notable for its inclusion of the Spartan satellite, which was constructed to gather significant data on the behavior of astrophysical phenomena. Spartan's deployment advanced NASA's understanding of cosmic events critical to the field of astrophysics.

The crew aboard Endeavour was composed of seven well-trained astronauts, including Commander John W. Young and Pilot Brent Jett. Their expertise allowed them to efficiently execute the mission objectives, which were designed to enhance scientific understanding and demonstrate the capabilities of the Space Shuttle program. In addition to Spartan, the mission involved the deployment of the UoSAT-12 and the Pacific Telecommunications Council's PTC-1, emphasizing the importance of communication technologies in a globalized world.

Throughout the mission, the crew executed various onboard experiments, including material sciences, biology, and fluid physics, further contributing to a wide array of scientific knowledge. The Endeavour orbited Earth for 10 days, successfully showcasing the versatility of the Space Shuttle for both scientific and communications purposes, providing critical data for the scientific community and enhancing international relations through shared technological advancements.