The mission was STS-51-L. Its failed launch led to the tragic deaths of everyone on board which spacecraft?

In 1986, NASA's 25th mission lasted little over a minute, when a malfunctioning rocket booster on the Challenger space shuttle disintegrated, resulting in the deaths of all on board. The intended goals of the mission were to track satellites and observe Halley's Comet. The seven astronauts on board included a teacher who intended to bring space into the classrooms after the mission.

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