DULLES, Va.March 2, 2007--Orbital Sciences Corporation (NYSE:ORB) announced today that its Chairman and CEO David W. Thompson and Vice Chairman and CFO Garrett E. Pierce will make a presentation to investors and analysts during the Friedman, Billings, Ramsey & Co. 2007 Washington Conference to be held on Thursday, March 8 in Washington, DC. The company's presentation is scheduled to begin at 9:55 a.m. EST.

Orbital will provide a link to the webcast of the audio portion of the company's presentation, as well as post the presentation slides on the company's web site at http://www.orbital.com/Investor/. Orbital will maintain the link to the conference replay and keep the presentation slides available for five business days following its presentation.

About Orbital

Orbital develops and manufactures small space and rocket systems for commercial, military and civil government customers. The company's primary products are satellites and launch vehicles, including low-orbit, geosynchronous and planetary spacecraft for communications, remote sensing, scientific and defense 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 offers space-related technical services to government agencies and develops and builds satellite-based transportation management systems for public transit agencies and private vehicle fleet operators.


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

    SOURCE: Orbital Sciences Corporation