Thousands of schoolchildren watched their teacher die on live television.

Challenger: Seventy-Three Seconds That Shocked the World

America watches a school teacher and six astronauts die live on television

Space Shuttle Challenger broke apart 73 seconds after launch on January 28, 1986, killing all seven crew members and traumatizing a generation who watched it live on television.

On January 28, 1986, at 11:38 AM Eastern Standard Time, Space Shuttle Challenger lifted off from Kennedy Space Center. Seventy-three seconds later, it was gone. An O-ring in the right solid rocket booster, made brittle by the unusually cold Florida morning (26°F), failed to seal properly. Hot gas escaped, ignited the external fuel tank, and destroyed the vehicle.

All seven crew members died — though investigators later determined they likely survived the initial explosion. The crew cabin detached intact, reaching an altitude of 65,000 feet before falling into the Atlantic. Evidence suggested some crew members survived for almost three minutes, long enough to activate emergency breathing devices.

The nation was particularly shaken because Christa McAuliffe, a New Hampshire schoolteacher, was aboard as part of NASA's Teacher in Space program. Thousands of schoolchildren across America watched the launch live in their classrooms.

President Reagan, who had been scheduled to give the State of the Union address that evening, instead addressed the nation on the disaster. His speechwriter Peggy Noonan gave him words later ranked among the greatest presidential speeches: "We will never f…

💡 Richard Feynman, the Nobel Prize-winning physicist on the investigation commission, famously demonstrated the O-ring problem during a live televised hearing by dipping one in his glass of ice water.