Orbital Sciences is the second of two U.S. firms hired by NASA to fly cargo to the space station, a $100 billion project of 15 nations, following the retirement of the space shuttles in 2011.
Rival Space Exploration Technologies, or SpaceX, a privately owned California company, began work for NASA about 18 months before Orbital Sciences. It has already made a test flight and two cargo runs to the station, a permanently staffed research complex that flies about 250 miles above Earth.
SpaceX, which is owned and operated by billionaire entrepreneur Elon Musk, has a $1.6 billion NASA contract for 12 station resupply missions, as well as a backlog of more than 40 other Falcon rocket flights for commercial satellite companies and non-U.S. government agencies.
"We are delighted to now have two American companies able to resupply the station," NASA administrator Charles Bolden said in a statement.
"Congratulations to the teams at Orbital Sciences and NASA who worked hard to make this demonstration mission to the International Space Station an overwhelming success," he said.
Like SpaceX, Orbital Sciences also hopes to sell its rockets to customers beyond NASA.
"With two really good launches under our belt, things are picking up in terms of customer interest," Orbital Sciences Chairman and Chief Executive David Thompson said during a conference call with investment analysts last week.
The company debuted its medium-lift Antares rocket during a test flight on April 21. Its next mission, scheduled for December, is the first of eight cargo runs to the station under a $1.9 billion contract with NASA.
(Editing by Jane Sutton and David Brunnstrom)
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