Kalpana Chawla
In 2000, Chawla was selected for her second voyage into space, serving again as a mission specialist on STS-107. The mission was delayed several times, and finally launched in 2003. Over the course of the 16-day flight, the crew completed more than 80 experiments. Kalpana was one of the seven people killed in the  disaster on February 1, 2003.