-- NSS-9 Spacecraft Is Second Order of Orbital's STAR Satellite

Platform by SES GLOBAL Family of Satellite Service Providers --

DULLES, Va.Nov. 20, 2006--Orbital Sciences Corporation (NYSE:ORB) today announced that it has been selected by SES NEW SKIES of the Netherlands, to design, build and deliver the NSS-9 commercial communications satellite. This satellite will be based on Orbital's flight-proven STAR 2 platform, which will generate 2.3 kilowatts of payload power and carry 28 active transponders. The NSS-9 satellite will be located at 183 degrees East longitude, but will also be capable of being deployed to other locations in the SES fleet. The NSS-9 satellite order is the 18th Orbital geosynchronous commercial communications satellite ordered by customers throughout the world, including the North American, European and Asia/Pacific markets.

Mr. Robert Bednarek, President and Chief Executive of SES NEW SKIES, said, "With the procurement of NSS-9 for launch in 2008 and the upcoming launch of NSS-8 in January 2007, SES NEW SKIES will significantly expand its transmission capacity, in-orbit back-up and overall fleet flexibility in the best interest of our customers. This ongoing fleet development serves to demonstrate the long-term commitment that the SES Group brings to global satellite coverage and connectivity. We look forward to working closely with Orbital on the NSS-9 mission, and are confident that they will deliver an excellent spacecraft that matches SES' high quality standards."

The NSS-9 is the second order placed in 2006 by an SES GLOBAL member company for satellites based on Orbital's STAR platform. Earlier this year, Orbital teamed with Alcatel Alenia Space to supply the STAR bus and perform systems integration for SES AMERICOM's AMC-21 satellite.

"Our entire team is extremely excited about this new contract win with another of the SES GLOBAL family of satellite service companies," said Dr. Ali Atia, head of Orbital's geosynchronous satellite unit. "With the NSS-9 order, Orbital's STAR-based satellite has once again shown that it is the world's 'platform of choice' for reliable, high-performance spacecraft in the sub-five kilowatt power class."

About SES NEW SKIES

SES NEW SKIES is an SES GLOBAL company (Euronext Paris and Luxembourg Stock Exchange: SESG) offering satellite communication services to a range of customers including telecommunications providers, broadcasters, corporations and governments around the world. SES NEW SKIES owns and operates a global fleet of five satellites in orbit, with an additional spacecraft under construction (NSS-8) and ground facilities around the world. Headquartered in The Hague, the company has offices in Hong Kong, New Delhi, Sao Paulo, Singapore, Sydney and Washington, D.C. In addition to NEW SKIES, SES GLOBAL wholly owns market-leading satellite operators SES ASTRA in Europe and SES AMERICOM in North America and also holds strategic participations in AsiaSat in Asia, Star One in Latin America, SES Sirius in Europe, Ciel in Canada and Quetzsat in Mexico. SES GLOBAL provides outstanding satellite communications solutions via a combined fleet of 44 satellites across the globe.

Further information on the company is available at www.ses-newskies.com and on SES GLOBAL at www.ses-global.com.

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-orbit, geosynchronous-orbit 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.

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

Note to Editors: A high-resolution artist rendering of the NSS-9 satellite in orbit is available at: http://www.orbital.com/NewsInfo/Images/GEO/index.html.


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

    SOURCE: Orbital Sciences Corporation