In 1985, Mukai was selected as one of three Japanese
Payload Specialist candidates for the First Material Processing Test (Spacelab-J) which flew aboard
STS-47. She also served as a back-up payload specialist for the Neurolab (
STS-90) mission. Mukai has logged over 566 hours in space. She flew aboard
STS-65 in 1994 and
STS-95 in 1998. She is the first Japanese woman to fly in space, and the first Japanese citizen to fly twice. In 2009 Mukai was a visiting lecturer at the
International Space University.
STS-65 STS-65 Columbia (July 8–23, 1994) was the second International Microgravity Laboratory (IML-2) flight. The mission consisted of 82 investigations of Space Life Science (Human Physiology, Space Biology, Radiation Biology, and Bioprocessing) and Microgravity Science (Material Science, Fluid Science and Research on the Microgravity Environment and Countermeasures). IML-2 was also designated as an extended duration orbit mission focusing on medical experiments related to the cardiovascular system,
autonomic nerve system, and
bone and
muscle metabolism. The mission was accomplished in 236 orbits of the
Earth, traveling over 6.1 million miles in 353 hours and 55 minutes.
STS-95 STS-95 Discovery (October 29 to November 7, 1998) was a nine-day mission during which the crew supported a variety of research payloads including deployment of the Spartan solar-observing spacecraft, the
Hubble Space Telescope Orbital Systems Test Platform, and investigations on space flight and the
aging process. The mission was accomplished in 134 Earth orbits, traveling 3.6 million miles in 213 hours and 44 minutes. == After her return from space ==