NASA says it may have discovered the root cause of two consecutive launch failures of Orbital Sciences Corp.’s Taurus XL rocket, a manufacturing defect that could affect the company’s Antares rocket being developed to loft commercial resupply missions to the International Space Station (ISS). William Gerstenmaier, associate administrator for NASA’s Human Spaceflight and Operations Directorate, says NASA and Orbital investigative teams have traced the problem to a heat-treated frangible ...


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