Radio Thermal Generators (RTG's)

I’ve read about Radio Thermal Generators used in everything from satellites to pacemakers. How do these things work?

Did you try going to
Did you try typing in “radio thermal generator” (with quotes) there?

I did.
I found out what they are just by reading descriptions of webpages- no clicking was needed!

I’m not telling you!!!

Nyaa Nyaa Nyaahh!