What height was the challenger at when exploded?

The Space Shuttle Challenger exploded approximately 73 seconds after liftoff at an altitude of about 48,000 feet (approximately 14,600 meters). The disaster occurred on January 28, 1986, during its launch from the Kennedy Space Center in Florida. The explosion was caused by the failure of an O-ring seal in one of the solid rocket boosters, leading to the tragic loss of all seven crew members.