This image shows the test firing of ExoTerra Resources' xenon fueled microsatellite thruster. Credit: ExoTerra Resources

SAN FRANCISCO -- Colorado-based ExoTerra Resources has supplied York Space Systems with 21 propulsion modules for the Space Development Agency (SDA) Transport Layer.

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Debra Werner is a correspondent for SpaceNews based in San Francisco. Debra earned a bachelor’s degree in communications from the University of California, Berkeley, and a master’s degree in Journalism from Northwestern University. She is a recipient...