On these spacecrafts, Pu-238 dioxide fuel undergoes natural decay like in a nuclear reactor to produce heat that SiGe thermocouples/unicouples convert to hundreds of Watts of electrical power.
Pu-238 dioxide fuel undergoes natural decay like in a nuclear reactor to produce heat that SiGe thermocouples/unicouples convert to hundreds of Watts of electrical power. This is on these spacecrafts.