A powerful solar flare forced Orbital Sciences Corp. to delay the first commercial mission of its Cygnus cargo vehicle atop the company’s new Antares rocket Wednesday, delaying delivery of 1,465 kg. of supplies and scientific gear to the International Space Station by at least a day. Company engineers scrubbed the planned attempt after determining that radiation levels “exceeded by a considerable margin the constraints imposed on the mission to ensure the rocket’s electronic systems are ...
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