Arlington-based Alliant Techsystems is merging its aerospace and defense segments with Orbital Sciences, the Dulles-based commercial space firm, the companies said in a joint announcement Tuesday ...

Nearly a year after Orbital Sciences' rocket carrying supplies to the International Space Station exploded at liftoff, an aerospace company that had refurbished the ship's aging Soviet-era engines ...

Orbital ATK was created by the merger of Dulles, Va.-based Orbital Sciences Corp. and the aerospace and defense divisions of Arlington, Va.-based Alliant Techsystems Inc.

Orbital Sciences Corp., the Northern Virginia aerospace company whose Antares rocket exploded shortly after liftoff last week, will "likely" end its use Soviet-made engines in future missions for ...

Gov. Bob McDonnell today congratulated Orbital Sciences Corporation for the successful first launch of its new Antares medium-class launch vehicle from the recently completed Pad 0A at the Mid ...

Dulles-based aerospace and defense company Orbital Sciences Corporation is expanding its campus with four new buildings, and plans to hire about 500 to 600 additional employees over the next three ...

The CEO of Orbital Sciences, whose rocket exploded just after launching Tuesday evening, says the company is determined to fulfill its commitment to carry cargo into space for NASA, but that it ...

Orbital Sciences has launched more than 800 satellites, logged 1,000 years worth of operations and its craft have traversed two billion miles in the past three decades.

NASA pays it billions. Its rockets sport mythical names like Minotaur and Pegasus. And its $2 billion deal to resupply the International Space Station had gone well - until this week.

Orbital Sciences Corp. is making final preparations for the first flight of its Antares rocket, a commercially-built booster designed to launch cargo ships to the International Space Station.

Dulles-based Orbital Sciences said Wednesday that it does not expect Tuesday’s Antares rocket launch failure to affect its 2014 outlook, but is unclear what impact the incident will have on the ...

NASA pays it billions. Its rockets sport mythical names like Minotaur and Pegasus. And its $2 billion deal to resupply the International Space Station had gone well — until this week.