NASA wants to offload cargo runs to the space station to private companies so it can focus more on exploration. Orbital Sciences' Cygnus cargo ship just finished its first mission.

The second of two commercial spacecraft NASA has tapped to resupply the International Space Station wrapped up its qualifying run to the orbiting outpost successfully on Tuesday. It now is headed for incineration when it reenters Earth's atmosphere on Wednesday.

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Astronauts aboard the space station used the station's robotic arm to gently move Orbital Sciences Corporation's Cygnus cargo craft away from the station, releasing it at 7:31 Eastern Daylight Time on Tuesday.

It was a wipe-the-brow moment for NASA. For eight years, the agency has worked to outsource cargo-hauling duties to the space station in anticipation of retiring the space shuttles in 2011. The agency was tasked with refocusing its human-spaceflight program on exploration beyond low-Earth orbit.

While the space agency and Congress are still sorting out those next steps, NASA is claiming success for its work to stimulate the emergence of companies that own and operate their own rockets and cargo craft.

We are delighted to now have two American companies able to resupply the station, NASA Administrator Charles Bolden Jr. said in a statement Tuesday, referring to Space Exploration Technologies (SpaceX) in addition to Orbital Sciences. Orbital's success today is helping make NASA's future exploration to farther destinations possible.

Orbital Sciences, based in Dulles, Va., launched Cygnus atop the company's Antares rocket Sept. 18. The launch took place at the Mid-Atlantic Regional Spaceport, on the grounds of NASA's Wallops Island Flight Facility on the Virgina coast. The craft was to have docked with the space station four days later. But a software glitch prevented an initial attempt at a rendezvous.

Software engineers fixed the problem. But the delay prompted mission controllers to hold off on a second rendezvous attempt until an incoming Russian Soyuz spacecraft could deliver three crew members to the station. The Soyuz craft arrived on Sept. 25. Cygnus docked four days later, carrying some 1,300 pounds of food, clothes, and experiments designed by elementary, middle-school, and high-school students.

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Success of Cygnus cargo craft takes NASA step closer to new future (+video)