The World's First Nuclear-Powered Satellite Just Launched
City Labs' BOHR satellite launched aboard SpaceX Transporter-17 on July 7, 2026, becoming the world's first commercial nuclear-powered CubeSat in orbit.
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A Nuclear Battery Just Left Earth for the First Time Commercially
Every satellite launched into space faces the
same power problem. Solar panels work brilliantly in sunlight and fail
completely in shadow. Batteries provide backup power but add weight, degrade
over time, and run out. For missions that need to operate in permanently
shadowed lunar regions, in deep space beyond efficient solar range, or over
years-long durations without any maintenance, neither solution is enough. City
Labs has spent two decades developing a different answer, and on July 7, 2026,
that answer left Earth. BOHR, short for Betavoltaic Orbital High-Reliability,
is the world's first commercial nuclear-powered satellite and the first nuclear
CubeSat, launched aboard SpaceX Transporter-17 as a dedicated payload power
source providing continuous, long-duration electrical power entirely
independent of solar energy.
So, what does "nuclear-powered"
actually mean for a satellite this size? BOHR uses City Labs' proprietary
NanoTritium™ betavoltaic technology, which converts the beta particle emissions
of tritium, a radioactive isotope of hydrogen, directly into electrical
current. Unlike nuclear reactors, which use fission heat to generate power,
betavoltaics are solid-state, silent, and produce no heat of their own. They
generate nanowatt to microwatt levels of continuous power with no moving parts
and no maintenance required, for over 20 years. Therefore, a spacecraft powered
by NanoTritium™ doesn't need to orient itself toward the sun, charge a battery
bank during daylight passes, or worry about entering eclipse periods that cut
its power supply.
How NanoTritium™ Technology Works and What Makes It Safe
A nuclear battery in a commercial satellite
raises an immediate question about safety, and City Labs addresses it directly
through the nature of the technology itself. Tritium is the most benign of all
radioactive isotopes, the same material already used in self-illuminating Exit
signs found in schools, theaters, and commercial aircraft worldwide. The
radiation it emits consists entirely of low-energy beta particles, which cannot
penetrate the outer layer of human skin and are blocked by any thin material, including
the satellite's own housing.
In practice, City Labs' NanoTritium™ batteries
operate at extremely low radiation levels and are engineered for safe handling,
transportation, and integration within standard commercial launch environments,
meaning they don't require specialized containment, hazmat handling, or
restricted access zones during satellite integration. In a historic regulatory
first, the BOHR mission exercised the FAA pathway for nuclear launch approval
as laid out in National Security Presidential Memorandum-20, with the launch
safety analysis independently reviewed and validated by Sandia National
Laboratories, one of the U.S. government's most trusted nuclear authorities. On
September 30, 2025, the FAA issued its affirmative payload authorization for
the BOHR mission, formally establishing that commercial nuclear power sources
are cleared for routine spaceflight under U.S. regulatory frameworks.
What BOHR Proves and Where It Points Next
On the BOHR spacecraft itself, the NanoTritium™
system powers and validates the payload demonstration, while conventional solar
power handles satellite bus operations. That division of labor is deliberate:
the mission is designed as a proof-of-concept for the technology in orbit,
establishing its performance, reliability, and regulatory pathway before City
Labs scales toward larger implementations. As City Labs CEO Peter Cabauy put
it, BOHR demonstrates that safe, compact, and regulatory-approved nuclear power
systems are ready for routine commercial deployment, enabling persistent,
always-on payload operations that are not constrained by sunlight or battery
life.
The timing is significant. As NASA's Artemis
program pushes human presence back to the Moon, the need for power systems that
operate in permanently shadowed lunar craters has become one of the most
pressing engineering challenges in space. The Moon's south polar craters, which
receive no sunlight and reach temperatures below -200°C, are also the most
scientifically and commercially valuable locations on the lunar surface because
they contain water ice. City Labs' BOHR arrives as the first commercial answer to
that power challenge. The mission builds on years of private investment
alongside support from the Department of War's Operational Energy Innovation
Directorate, the Air Force Research Laboratory, AFWERX, NASA, and SpaceWERX,
with a $1.5 million DARPA contract awarded in June 2026 further validating the
technology's next-generation potential.
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