Advanced Reactors

Nuclear Startup Antares Wins $161 Million Award To Develop Reactor For Space

By David Dalton
14 September 2026

Company plans to deploy RS-1, a variant of its terrestrial microreactor

Nuclear Startup Antares Wins $161 Million Award To Develop Reactor For Space
A rendering of a nuclear-powered spacecraft in Earth orbit. Image courtesy Antares.
US Space Force, the space service branch of the US armed forces, has awarded California nuclear startup Antares a $161m (€139m) contract to develop a fission reactor for spacecraft, an award that the company says is the largest current Department of War award of its kind.

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