"Illustration showing the sequence of events during the launch of the Space Shuttle Challenger on January 28, 1986. Challenger exploded at 16:38 UTC, 73 seconds after lift-off from the Kennedy Space Centre, Florida, USA. The illustration shows the resulting debris, vapour and smoke trails The explosion occurred as a result of a failure of one of the O-rings in a seal on one of the booster rockets. A subsequent leakage of fuel triggered the explosion that killed all seven crew. The disintegration took place over the Atlantic Ocean, off the coast of Florida."