Orbital-Built NSS-9 Communications Satellite Successfully Launched For SES NEW SKIES

— Company’s First Spacecraft of 2009 Is Performing As Expected Early In Its Mission —

— Orbital Built and Delivered NSS-9 Satellite In Less Than 23 Months —

Orbital Sciences Corporation (NYSE:ORB), the world’s leading manufacturer of smaller-sized geosynchronous (GEO) communications satellites, announced today that the NSS-9 satellite, which is based on the company’