Sullivan steps outside Challenger; first American woman to walk in space
NASA selected its first female astronauts in 1978. Six years later, none had yet performed a spacewalk. On October 11, 1984, Kathryn D. Sullivan opened the hatch of Space Shuttle Challenger and became the first American woman to perform a spacewalk. For three and a half hours, she and fellow mission specialist David Leestma worked the Orbital Refueling System, installing a valve and transferring 59 kilograms (130 pounds) of hydrazine into a satellite propulsion mock-up built to mimic Landsat 4. The test proved a satellite could be refueled without ever coming home.
NASA had flown six years of shuttle missions before an American woman worked outside the spacecraft; Sullivan's walk was the first time a woman from that 1978 astronaut class worked outside the spacecraft. It also answered a practical engineering question for American satellite operators: an orbiter crew could service a spacecraft in place, a capability later used in the shuttle-serviced Hubble Space Telescope missions.
QHow many orbits did Challenger complete during the mission that carried Sullivan's spacewalk?
STS-41-G circled the Earth 132 times across 197.5 hours in orbit. That workload came on top of the spacewalk itself, which consumed only a fraction of the eight-day flight. The orbiter's broader mission plan packed in multiple science payloads alongside the refueling test, including the OSTA-3 pallet carrying the SIR-B radar instrument, the FILE and MAPS atmospheric experiments, and a large format camera used for Earth imaging. Challenger also carried eight small experiment canisters, known as Getaway Specials, that activated during the flight. The orbital count shows how much of the mission's time went to data collection and deployment work, not just the single EVA most remembered today.
QHow long had Sullivan trained for STS-41-G before the mission actually launched?
Sullivan was formally assigned to STS-41-G in September 1983, more than a year before Challenger finally lifted off on October 5, 1984. That gap gave the crew extended time to drill procedures for the Orbital Refueling System test and the satellite deployments planned for the flight. The mission itself, once underway, lasted just under eight days, completing 132 orbits of Earth across 197.5 hours before landing back at Kennedy Space Center on October 13, 1984. The year-plus of preparation compressed into barely a week in orbit.
QWhat was Kathryn Sullivan's professional background before she became an astronaut?
Sullivan trained as a geologist and oceanographer before joining NASA, credentials that shaped how she approached the orbital plumbing work outside Challenger. Her academic grounding in earth sciences connected directly to the mission's broader Earth-observation goals, including the radar and atmospheric experiments running on the OSTA-3 pallet during the same flight. NASA had drawn her into the astronaut corps as part of the 1978 selection class that first opened spaceflight to women. Her scientific training, rather than a military or test-pilot background, marked a different route into the astronaut office than many of her predecessors had taken.
