They said it was an o ring failure, how did they figure it out when everything was blown to bits
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In the specific case of the Challenger; they actually knew, going into the launch, that there was a highly specific risk of the o-rings failing, to the degree that a significant number of engineers associated with the program wanted to scrub the launch.
There was also significant video evidence of the launch that showed a plume of exhaust coming out of the damaged SRB that would only really have been caused by the failure of the o-ring.
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