NextFin news, Scientists from Ohio State University announced on Tuesday a breakthrough in nuclear rocket propulsion technology that could dramatically shorten the duration of missions to Mars. The new design, called the Centrifugal Nuclear Thermal Rocket (CNTR), uses liquid uranium fuel to directly heat rocket propellant, enabling faster travel with less fuel consumption compared to conventional chemical and nuclear rockets.
The CNTR concept involves spinning liquid uranium inside rapidly rotating cylinders at 7,500 RPM, using centrifugal force to keep the molten uranium against the cylinder walls. Hydrogen or other propellants flow through this liquid fuel, which heats them to extremely high temperatures, producing thrust with a specific impulse potentially reaching 1,800 seconds—double that of previous nuclear thermal rockets.
According to Spencer Christian, a PhD student leading the CNTR prototype construction at Ohio State, this technology could enable a one-way trip to Mars in six months, significantly reducing the health risks associated with prolonged space travel such as radiation exposure and muscle atrophy. Some reports suggest that with further advancements, travel times could be cut to as little as three months.
Associate Professor Dean Wang, a senior member of the project, emphasized the importance of reducing mission durations to mitigate health risks for astronauts and to enable more ambitious missions to the outer solar system, including Saturn, Uranus, and Neptune.
The CNTR design addresses limitations of earlier nuclear thermal propulsion tested in the 1960s Rover/NERVA program by replacing solid uranium fuel rods with liquid uranium, allowing higher operating temperatures and improved efficiency. The rotating liquid fuel also provides inherent safety features, such as negative temperature feedback that slows the nuclear reaction if temperatures rise too high.
The research team, supported by NASA funding and collaborating with the Department of Energy’s Oak Ridge National Laboratory, is currently tackling engineering challenges including uranium vaporization and material durability under extreme conditions. They are exploring advanced fuel coatings and electromagnetic techniques to mitigate uranium vapor loss and maintain performance.
The CNTR system is designed with 37 rotating fuel elements in a reactor core approximately three feet tall, capable of operating for about 10 hours with cooling periods between burns. This runtime is sufficient for interplanetary missions, and the system’s flexibility allows the use of various propellants such as ammonia, methane, or propane, potentially enabling in-space refueling from asteroid or Kuiper Belt resources.
This development aligns with renewed interest in nuclear propulsion from NASA and the Defense Advanced Research Projects Agency (DARPA), which plan to demonstrate nuclear thermal propulsion technology by 2027 through the DRACO program.
If successful, the CNTR technology could revolutionize human space exploration by making Mars and other distant destinations accessible within months rather than years, opening new possibilities for robotic and crewed missions across the solar system.
Sources: Irish Independent (2025-09-16), The News International (2025-09-15), Ohio State University research reports, and related scientific publications.
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