Another aspect of this that the article fails to mention is that NASA has tried to come up with more efficient thermo-acoustic energy converters than the existi

Another aspect of this that the article fails to mention is that NASA has tried to come up with more efficient thermo-acoustic energy converters than the existing seebeck-effect RTG's for radioactive sources [1], but the projects went terribly over budget and got cancelled. [1] http://www.planetary.org/blogs/guest-blogs/van-kane/20131208-the-asrg-cancellation-in-context.html http://www.planetary.org/blogs/guest-blogs/van-kane/20131208...