Two "Radio-Isotope Generators" (RTG), containing Plutonium, generated heat by radioactive decay, which in turn was converted into electricity. The Pioneer spacecraft could not be powered by solar panels, as the distance from the Sun was too great.
Two "Radio-Isotope Generators" (RTG), containing Plutonium, generated heat by radioactive decay, which in turn was converted into electricity. The Pioneer spacecraft could not be powered by solar panels, as the distance from the Sun was too great.