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Today 40 Years Ago The Space Shuttle Challenger Exploded over the Florida Coast right after Liftoff from Cape Canaveral/Cape Kennedy .
According the final report concerning the explosion the shuttle exploded 73 seconds into its flight, killing all seven crew members, including teacher Christa McAuliffe. The cause was the failure of O-ring seals in the right solid rocket booster due to cold temperatures.
This led to major changes in how NASA. from then on looked at safety of launches.
The seven man and woman crew included the first teacher and private citizen in Space Christa Mc Aulliffe
Here is the list of the members of the crew who perished in the explosion .