Sally Ride

In 1983, Sally Ride became the first American woman in space. She blasted off aboard Challenger, culminating a long journey that started in 1977 when the Ph.D. candidate answered an ad seeking astronauts for NASA missions.

In a lecture she gave at Berkeley, Ride said she saw the ad on Page 3 of the student newspaper.

"The moment I saw that ad, I knew that's what I wanted to do," she said.