• The European Space Agency's upcoming Mars mission will use a nuclear-powered device that harnesses the radioactive decay of americium to keep its components warm. Devices that harness the heat produced by the decay of radioactive elements are known as radioisotope heater units (RHUs). The ESA has historically relied on the US and Russia to provide RHUs that use plutonium-238, but it has been working on its own RHUs since 2009. The European RHUs will heat components in the mission's landing platform, which will extend the lander's life, allowing it to become a backup power source in case there are issues in deploying the rover.