Before revision: Thermoelectric application A silicon germanium thermoelectric device , MHW-RTG3 , was used in the Voyager 1 and 2 URLSilicon germanium thermoelectric devices were also used in other MHW-RTGs and GPHS-RTGs aboard Cassini, Galileo, Ulysses , and Flight Units F-1 and URL
After revision: Thermoelectric application A silicon germanium thermoelectric device , MHW-RTG3 , was used in the Voyager 1 and 2 spacecraft.Silicon– germanium thermoelectric devices were also used in other MHW-RTGs and GPHS-RTGs aboard Cassini, Galileo, Ulysses .–