MMRTGs
The Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) is a type of power source used by spacecraft to produce electricity from the heat released by the decay of plutonium-238. It provides reliable, long-lasting power in environments where sunlight is weak or unavailable, enabling missions to distant planets, moons, and shadowed terrain. The MMRTG is designed for multi-mission use and is developed through collaboration between NASA and the U.S. Department of Energy.
In construction, the MMRTG uses several GPHS (General Purpose Heat Source) modules that contain plutonium-238 in
Missions and usage: The MMRTG has supported NASA missions such as the Mars Science Laboratory, which powers
Safety and development: Pu-238 is highly radiotoxic if released, so MMRTGs are built with robust containment