Launch of the Orbital Sciences Corp. Antares liquid-fueled rocket on April 21 gives NASA a second U.S.-owned vehicle to use in resupplying the International Space Station, vindicating a commercial approach that has been in play through two presidential administrations. The 5 p.m. liftoff followed two previous launch attempts last week that had to be scrubbed due to uncooperative weather over the new launch pad at the Mid-Atlantic Regional Spaceport on Wallops Island, Va. Ten minutes ...


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