Sally Ride, the first American woman to trailblaze her way into space, died of pancreatic cancer at the age of 61. She was a brilliant physicist who became a role model for young women who until then only dreamed of a career in space exploration. She truly broke the space ceiling. Ride flew on the shuttle Challenger on June 18, 1983 and on a second mission in 1984. To read more about her life and accomplishments, click here.