Kathryn Sullivan, American Original
In this, her second venture into space, STS-31 mission specialist Kathryn Sullivan posed for this photograph as she prepared for a potential third spacewalk. During the mission, the Discovery crew deployed the Hubble Space Telescope.
Sullivan's first venture into space began in October 1984, when she became the first American woman to walk in space.
In 1992, Sullivan served as payload commander on STS-45, the first Spacelab mission dedicated to NASA's Mission to Planet Earth. During the 9-day mission, the crew conducted experiments that produced detailed measurements of atmospheric chemical and physical properties, which contributed significantly to scientific understanding of Earth's climate and atmosphere.
With the completion of her third mission, Sullivan logged over 532 hours in space.
Image Credit: NASA