Orbital to Open New Southern California Engineering and Technology Center This Fall

-- Company to Tap Region's Space Technology Expertise, Monitor
Local Suppliers and Support L.A.-Area Customers --

-- California-based Workforce to Expand to Over 150 Engineers,
Technicians and Other Space Industry Professionals --
DULLES, Va.--(Business Wire)--
Orbital Sciences Corporation (NYSE:ORB) is expanding its workforce
in the Southern California area with the opening of a new engineering
and technology center in the Fall of this year, the company announced
today. In order to augment Orbital's launch vehicle and space systems
engineering capabilities, the company is finalizing plans to establish
a West Coast office to tap the wealth of aerospace engineering
expertise in the Southern California area. Initially, Orbital expects
to employ 30 to 40 engineers in support of Orbital's Taurus II space
launch vehicle as well as the company's missile defense efforts, and
to monitor the work of suppliers in the region.

"Southern California boasts a wealth of talented engineers,
particularly with expertise in liquid-fueled launch vehicles and
advanced space systems," said Greg Jones, Orbital's Vice President,
Strategy and Business Development, who is spearheading the effort. "We
have been considering opening a Los Angeles-area engineering office
since we began thinking about the development of Taurus II. As the
vehicle design has evolved, so too have our requirements in terms of
the launch vehicle engineering expertise that we need on the project.
The deep pool of talent in Southern California will allow us to add to
Orbital's already considerable launch vehicle engineering prowess."

The company is leasing offices in the Huntington Beach, California
area, with planned occupancy this October. The new office is in
addition to Orbital's current California workforce that is currently
based at Vandenberg Air Force Base and at NASA's Ames Research Center.
When fully staffed, the technical center will bring Orbital's
California-based workforce to over 150 people.

Although the initial focus of activity at the center will be
related to launch vehicles, future growth is envisioned to be fueled
by the company's expanding presence in the market for national
security and interplanetary space systems, serving customers with
operations in the Los Angeles vicinity. In addition, enhanced supplier
management of area subcontractors on company satellite and rocket
programs will be conducted from the new office.

About Orbital

Orbital develops and manufactures small rockets and space systems
for commercial, military and civil government customers. The company's
primary products are satellites and launch vehicles, including
low-Earth orbit, geosynchronous-Earth orbit and planetary spacecraft
for communications, remote sensing, scientific and defense missions;
human-rated space systems for Earth-orbit, lunar and other missions;
ground- and air-launched rockets that deliver satellites into orbit;
and missile defense systems that are used as interceptor and target
vehicles. Orbital also provides satellite subsystems and space-related
technical services to government agencies and laboratories.

Orbital Sciences Corporation
Barron Beneski (703) 406-5528
Public and Investor Relations
Beneski.barron@orbital.com

Copyright Business Wire 2008