For context, some moon rovers have radioisotope heaters, https://en.wikipedia.org/wiki/Chang%27e_4#Chang'e_lander_and_Yutu-2_rover https://en.wikipedia.org/wik

For context, some moon rovers have radioisotope heaters, https://en.wikipedia.org/wiki/Chang%27e_4#Chang'e_lander_and_Yutu-2_rover https://en.wikipedia.org/wiki/Chang%27e_4#Chang'e_lander_and... ("Both the stationary lander and Yutu-2 rover are equipped with a radioisotope heater unit (RHU) in order to heat their subsystems during the long lunar nights") https://en.wikipedia.org/wiki/Lunokhod_1#Rover_description https://en.wikipedia.org/wiki/Lunokhod_1#Rover_description ("During the lunar nights, the lid was closed, and a polonium-210 radioisotope heater unit kept the internal components at operating temperature") https://en.wikipedia.org/wiki/Radioisotope_heater_unit https://en.wikipedia.org/wiki/Radioisotope_heater_unit