WASHINGTON — Reusable rocketry in Europe took a step forward last year with a funding boost for Prometheus, a program meant to develop a reusable engine manufacturable at one-tenth the cost of the Ariane 5’s first-stage liquid engine. A parallel effort dubbed Callisto could test a European ability to launch, return and refly a rocket from the Guiana Space Centre in South America.

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Caleb Henry is a former SpaceNews staff writer covering satellites, telecom and launch. He previously worked for Via Satellite and NewSpace Global.He earned a bachelor’s degree in political science along with a minor in astronomy from Grove City College.