Discovery Returns from an Atmospheric Research Mission
On September 26, 1991, space shuttle Discovery returned to Kennedy Space Center after the STS-48 mission.
On September 26, 1991, the space shuttle Discovery returned to Kennedy Space Center, bringing the STS-48 mission to an end.

Studying Earth's atmosphere
During the mission, Discovery deployed the Upper Atmosphere Research Satellite. The observatory was designed to investigate Earth's upper atmosphere, including the protective ozone layer.
Why it matters
STS-48 connected human spaceflight with research about our own planet. The shuttle delivered a scientific observatory to orbit and then returned its crew to Earth.