Orbital Sciences Cygnus cargo ship reached the International Space Station on Sunday, the second commercial spacecraft to fly to the orbital outpost.
Cygnus' 7 a.m. EDT arrival came a week later than originally planned, delayed first by a software glitch and then by the higher priority docking of a Russian Soyuz capsule with three new station crewmembers.
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Orbital is one of two firms hired by NASA to restore a U.S. supply line to the station following the retirement of the space shuttles in 2011. Rival Space Exploration Technologies, which started work about 18 months before Orbital, already has made a test flight and two cargo runs to the station, a project of 15 nations.
SpaceX, as the company is called, is taking a bit of a hiatus as it prepares to test a beefed up version of its Falcon 9 rocket. Launch is expected between noon and 2 p.m. EDT on Sunday from a new complex at Vandenberg Air Force Base in California.
Orbital's Cygnus capsule blasted off aboard an Antares rocket from Wallops Island, Va., on Sept. 18. The spacecraft, which is on a demonstration flight, is expected to remain docked at the station for about a month.