Far from being sci-fi, they are quite common (if we’re talking about the same thing): http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator#History Common enough that they’re the main reason NASA has been targeted by green groups, even.
Cool!
Far from being sci-fi, they are quite common (if we’re talking about the same thing): http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator#History Common enough that they’re the main reason NASA has been targeted by green groups, even.
Cool!