I wonder if they can even use a solar panel that far out. How can a 40 year old battery still be working, and if they are, why can't I get one for my truck?
If you’ll bother to read just 6 posts back (I know that’s a whole lot to ask) but a member named Blackbat (and it’s even on the same page as you)
He explains the use of “Multihundred-Watt radioisotope thermoelectric generators (MHW RTG)” type system.
He goes on further in detail.
So thorough, he even educated the guy on here from NASA.