Momentus, a Santa Clara, California, startup building an in-space transportation business, successfully tested its water plasma propulsion in orbit on the El Camino Real mission, a 16-unit cubesat. Momentus employees shown with the El Camino Real satellite.

Momentus’ is reporting success in on-orbit testing of water plasma propulsion and other key elements of its Vigoride in-space transportation vehicle.

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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...