In brief
- The progress announcement was published October 20, 2026.
- Late 2028 remains a launch target.
The news is about making useful power
On October 20, 2026, NASA reported progress on SR-1 Freedom’s power module. Sierra Lobo will supply a closed-Brayton-cycle conversion system under a Glenn Research Center contract awarded in 2024. The reactor is the responsibility of the US Department of Energy’s Idaho National Laboratory.
It helps to separate two jobs: generating heat and turning it into usable electricity. This announcement concerns the second. It does not establish that the complete spacecraft has passed every test.
Electric propulsion, not a nuclear liftoff
The mission page describes electric propulsion powered by a fission reactor. Launch is targeted for late 2028, with arrival at Mars in 2029. These are planning targets, not dates from a journey that has already happened.
NASA says the reactor will remain inactive until the spacecraft leaves Earth orbit. The plan also includes carrying three SkyFall helicopters. This is not a consumer product or an invitation to book a trip.
How to read the next milestones
A contract, a component test and a mission in flight are different milestones. Think of building a house: having the electrical equipment does not mean the house is finished.
This article’s image is a frame from a real thruster test published on the mission page. It helps illustrate the technology, but it does not show SR-1 Freedom in flight or prove that its nuclear power module is ready.
Sources and context
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