Horror on Instagram: "On January 28, 1986, tragedy struck when NASA’s Space Shuttle Challenger (STS-51-L) disintegrated just 73 seconds after liftoff, claiming the lives of all seven crew members. Among them was Christa McAuliffe, a teacher chosen to be the first civilian in space. The disaster was broadcast live to millions of Americans, including countless schoolchildren, making it one of the most devastating and unforgettable moments in the history of space exploration. Investigators later de