Space Reactor‑1 Freedom
expected 2028
expected 2028
—hype
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Space Reactor‑1 Freedom is expected 2028. The exact day has not been announced yet.
Spacecraft launch, with the target date from Wikidata.
Space Reactor-1 Freedom (SR-1) is a pathfinder NASA spacecraft intended to be the first nuclear fission-powered interplanetary mission and to demonstrate nuclear electric propulsion (NEP) in deep space. Announced in March 2026, the spacecraft would combine a closed Brayton cycle fission reactor generating more than 20 kW of electrical power with the Power and Propulsion Element (PPE) previously developed for the Lunar Gateway space station.
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Last verified Sep 16, 2026
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