Space ShuttleSpace Shuttle Discovery lifts off on a five-day mission to deliver the Upper Atmosphere Research Satellite (UARS) into a low Earth orbit, where the satellite spends over a year studying the outer layers of Earth’s atmosphere. UARS also focuses on study of Earth’s ozone layer. Other experiments are carried out aboard the orbiter by Commander John Creighton, Pilot Kenneth Reightler, , and mission specialists Mark Brown, Charles Gemar and James Buchli.