The Space Shuttle Challenger disaster occurred on January 28, 1986. The shuttle broke apart 73 seconds into its flight, killing its seven crew members. The spacecraft disintegrated over the Atlantic Ocean, off the coast of central Florida, after an O-ring seal failed. People all over the country viewed the disaster live because the shuttle was carrying Christa McAuliffe, who would have been the first teacher in space.
NASA, Knight Ridder Tribune