It may take weeks or even months for federal investigators to be certain of the answer, and perhaps they will never know for sure. At least ten separate teams of investigators are now probing every aspect of the mystery of why Challenger exploded; and Acting NASA Administrator William Graham vowed they would "provide the best national capability to study this, to analyze it, to find out how to correct it, and to ensure that it will never happen again."
Although attention at week's end was focusing on a possible burn-through of the casing on one of the shuttle's two solid-fuel booster...
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