Fascinating article, although I would quibble with the statement that Curiosity's is the "most important RTG in the solar system". While technically now beyond

Fascinating article, although I would quibble with the statement that Curiosity's is the "most important RTG in the solar system". While technically now beyond the heliopause, surely the cluster of 44 year-old RTGs powering the two Voyager probes are at least as important: at least to those of us who were fortunate enough to watch their journey slowly unfold from the beginning.