Before revision: RTG alternative Missions after 2010 requiring RTGs will instead use the Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) containing lead telluride (PbTe) thermocouples and Pu-238 dioxide for spacecraft power applications
After revision: RTG alternative Missions after 2010 requiring RTGs will instead use the multi-mission radioisotope thermoelectric generator (MMRTG) containing lead telluride (PbTe) thermocouples and Pu-238 dioxide for spacecraft power applications