DULLES, Va.June 30, 2004--Orbital Sciences Corporation (NYSE:ORB) today announced the recipients of its "Orbital Scholars and Grants" college scholarship program for the 2004-2005 academic year. Each year, in recognition of the outstanding academic achievements of the children of Orbital employees, the company awards $5,000 scholarships and $1,000 grants, payable over two years, to high school seniors or currently enrolled college students. The recipients are selected on the basis of high academic achievement and acceptance into an accredited four-year college or university. Each student is eligible to receive the award for a second year subject to continued academic progress.

"On behalf of all Orbital employees, I congratulate the recipients of this year's company scholarships," said Orbital's Chairman and Chief Executive Officer, David W. Thompson. "These young men and women have worked very hard to achieve the academic records that enabled them to qualify for and receive these awards. We are very proud to support their continued studies and to be able to help them pursue their academic goals."

For the 2004-2005 academic year, a total of 13 scholarship and grant awards were made. The recipients of these highly competitive awards are shown below.

    $5,000 Scholarship Winners:

    --  Dominique Bruno, who will attend Boston College and major in

    --  Joy Dunn, who will attend MIT and major in Astronautical

    --  Heather Graham, who will attend Stanford University and major
        in Biology

    --  Mariel Herbert, who will attend the University of Delaware and
        major in Biology and Psychology

    --  Tara Howard, who will attend the University of Maryland and
        major in Biochemistry

    --  Erfan Parvez, who will attend Cornell University and major in

    $1,000 Grant Winners:

    --  Rebecca Burtch, who will attend Virginia Polytechnic Institute
        and major in Hospitality and Tourism

    --  Ryan DeMars, who will attend the Georgia Institute of
        Technology and major in Mechanical Engineering

    --  Deepak Kumar, who will attend the University of Maryland and
        major in Business Management

    --  Jessica McDermott, who will attend Hollins University and
        major in Spanish and International Studies

    --  Matthew McGonagle, who will attend the University of Maryland
        and major in Mathematics and Physics

    --  Christopher Sprute, who will attend Arizona State University
        and major in Business

    --  Kristin Marie Weigle, who will attend Colby College and major
        in International Relations

Since 1992, Orbital's scholarship program has recognized children of company employees for their high academic achievements. To date, the company has awarded a total of 67 scholarships and grants in the amount of $186,000. The company is proud to play a small part in assisting with the advanced education of these exceptional students.

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

    SOURCE: Orbital Sciences Corporation