Is Space Running Out of Nuclear Fuel?

The article discusses the challenges of powering space exploration missions, particularly those venturing into the outer solar system where solar energy is insufficient. For over five decades, NASA has relied on plutonium-based Radioisotope Thermoelectric Generators (RTGs) to provide reliable power for rovers and space probes. However, the United States has now nearly depleted its plutonium reserves, posing significant obstacles for upcoming missions that depend on this fuel source. To address this shortage, researchers are exploring Americium as a promising alternative to plutonium. Americium’s availability, especially in Europe, offers potential to either replace or supplement plutonium in future space power systems. The article features insights from experts such as Chris Whiting from NASA’s Glenn Research Center and Dr. Ramy Mesalam from the University of Leicester’s Perpetual Atomics, highlighting ongoing efforts to develop Americium-based technologies for space applications.