On Jan. 28, 1986, the Space Shuttle Challenger exploded 73 seconds after takeoff. All seven crew members on board were killed. The disaster was one of the most significant events in NASA history, watched live by millions of people around the world. It grounded all space shuttle missions for almost three years. Adam Higginbotham, author of the book "Challenger: A True Story of Heroism and Disaster on the Edge of Space," talks about what happened, the lives lost, and what NASA learned from the disaster. 

Then, Christa McAuliffe, a 37-year-old high school teacher from New Hampshire, was one of those crew members. She was set to become the first teacher in space. NHPR's Patrick McNameeKing discusses McAuliffe's life and legacy.

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