Who was Christa McAuliffe?

Christa McAuliffe was a social studies teacher and one of the seven crew members that died in the Challenger accident. She loved it when the first mission took off and wanted to be an astronaut ever since. She finally got the chance when she was selected to go up in space as a teacher out of about 11,000 people who applied for the 'Teacher in Space' program. The Challenger shuttle blew up 73 seconds after take off.