Astronaut and physicist Sally Ride has died. Dr. Ride was the first American woman in space and flew aboard the Space Shuttle Challenger. Boston.com has an overview of Ride’s life.  NASA has an obituary and footage of Ride talking about her experience in space.  “Ride left NASA in August 1987 to join the faculty at the University of California, San Diego, as a professor of physics and director of the University of California’s California Space Institute. In 2001, she founded her own company, Sally Ride Science, to pursue her long-time passion of motivating girls and young women to pursue careers in science, math and technology.”