Plutonium 238 on the moon
Generators producing electricity through the radioactive decay of plutonium 238 have been used on all the Apollo moon missions. In the picture above, we see astronaut Alan Bean transferring plutonium 238 stored in a RTG (Radioisotope thermic generator) to the surface of the moon. This plutonium 238 was the main source of energy for experiments conducted on the moon’s surface.