STS-77 was the 77th mission of NASA's Space Shuttle program, launched on May 19, 1996. The mission was conducted using the Space Shuttle Endeavour and lasted for 10 days, during which the crew conducted various scientific experiments and technology demonstrations. One of the key objectives of STS-77 was to deploy the SPARTAN-201 satellite, which studied the Sun's corona. The mission also included the testing of new materials and technologies, contributing to advancements in space exploration and research. The crew returned safely to Earth on May 29, 1996.