As they struggle to get the U.S. moon program back on schedule, scientists are anxiously seeking the cause of Apollo 13's brush with disaster. At the same time, they are still analyzing the findings of earlier lunar missions. Both efforts are paying off handsomely:
> After six weeks of investigation, NASA's high-level review board proposed an explanation for the explosion of Apollo 13's oxygen tank. The blast was apparently caused by the failure of two thumbnail-sized automatic switches that are designed to shut off the oxygen tank's internal heater if its temperature rises above 80° F. Tests showed that the temperature,...
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