Thirty years ago, on October 11, 1984, a female American astronaut stepped outside her spacecraft for the first time. Kathryn D. “Kathy” Sullivan had work to do in the payload bay of the Space Shuttle Challenger, a mobile workplace travelling 17,500 miles per hour about 140 miles above the Earth. Sullivan was one of the six   <a href="http://blog.nasm.si.edu/space/sullivan/">...Continue Reading</a>