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Marsha Sue Ivins (born 15 April 1951) is an American astronaut and a veteran of five space shuttle missions.
Ivins, born in Baltimore, Maryland, earned a degree in aerospace engineering from the University of Colorado in 1973 and went to work for NASA's Johnson Space Center. She worked mainly on orbiter displays and controls before being assigned as a flight engineer in 1980 and co-pilot on NASA administrative aircraft. In 1984, Ivins was selected as an astronaut candidate. She has flown aboard missions STS-32 (1990), STS-46 (1992), STS-62 (1994), STS-81 (1997), and STS-98 (2001).