Orbital to Host Conference Call on March 5 to Discuss Acquisition of General Dynamics' Spacecraft Business

-- 11:00 a.m. Conference Call with Financial Analysts and Investors to be Webcast on Company’s Internet Site -

Defense News ~ DULLES, Va.--(BUSINESS WIRE)--Orbital Sciences Corporation (NYSE: ORB - News) today announced that it will conduct a conference call with financial analysts and investors tomorrow morning, March 5, 2010, at 11:00 a.m. to discuss the company’s agreement to acquire the spacecraft development and manufacturing business of General Dynamics Corporation’s (NYSE: GD - News) GD Advanced Information Systems subsidiary, which was announced earlier today. Tomorrow’s conference call will be hosted by:

• Mr. David W. Thompson, Chairman and Chief Executive Officer
• Mr. Garrett E. Pierce, Vice Chairman and Chief Financial Officer
• Michael A. Hamel, Senior Vice President of Corporate Strategy and Development

To listen to the conference call, participants should dial (888) 541-8767 and use the conference ID number 61000462. A replay of the conference call will be available approximately two hours after the call and will remain active until Friday, March 12, 2010. For access to the replay of the conference call, dial (800) 642-1687. International callers accessing the replay should dial (706) 634-7258 and use the same conference ID number.

For webcast registration and information, please visit Orbital’s web site at http://www.orbital.com/Investor. The company advises participants to register at least 20 minutes prior to the call to download and install any necessary audio software.

About Orbital

Orbital develops and manufactures small- and medium-class 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 exploration 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 U.S. Government agencies and laboratories.

More information about Orbital can be found at http://www.orbital.com

Contact:

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

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