Forget solar panels for a second. Early on July 7, a SpaceX Falcon 9 lifted off from Vandenberg Space Force Base carrying 81 satellites — and tucked among them was something genuinely new: the world’s first commercially built nuclear-powered satellite has reached orbit.
Meet BOHR — short for Betavoltaic Orbital High-Reliability — built by Florida-based company City Labs. It’s a small cubesat, but it’s carrying big ambitions: testing City Labs’ proprietary “NanoTritium” betavoltaic micropower source in space for the first time.
So how does it work? Instead of the massive plutonium cores used in NASA’s famous Voyager probes, this tech takes a gentler approach. It harnesses the beta particles emitted from the radioactive decay of tritium, converting them directly to electricity using a semiconductor. Think of it less like a nuclear reactor and more like a nuclear battery — small, steady, and remarkably long-lived.
BOHR itself is just a pathfinder — its tritium core isn’t actually powering the satellite yet, which still relies on solar panels for day-to-day operations. This flight is really about proving the concept works in the harsh environment of orbit.
Why does this matter?
Because solar power has a huge blind spot: darkness. City Labs’ technology could enable new spacecraft to operate in places current missions can’t survive for long — like the permanently shadowed craters at the moon’s poles. That’s not a random example, either — the lunar south pole is the prime target for NASA’s Artemis missions, thanks to its water ice deposits, and power sources that don’t need sunlight are exactly what future moon bases will need.
One more nice detail: safety by design. Tritium emits low levels of radiation, and City Labs says its power systems are engineered for safe handling, transport, and integration with standard commercial launch operations.
This launch is also historic on the paperwork side — it’s the first nuclear-powered mission approved under the FAA’s nuclear launch framework established by a 2019 presidential memorandum, clearing a regulatory path for more nuclear-powered spacecraft to follow.
As City Labs CEO Peter Cabauy put it: this is “a historic step for commercial nuclear power in space,” and a sign that “safe, compact, and regulatory-approved nuclear power systems are ready for routine commercial deployment.”
Small satellite, small nuclear battery, potentially huge implications — for defense missions, private industry, and someday, the people living in a moon base that never sees the sun.
A SpaceX Falcon 9 has successfully launched the world’s first commercially built nuclear-powered satellite, marking a significant milestone for the future of space power systems.
— Integrity ISR (@IntegrityISR) July 8, 2026
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