Five years ago, dairy farmer Darryl Vander Haak flipped the switch on the first electric generator in Washington State powered by manure.

VOA: standard.2010.02.23

Although solar panels will work on spacecraft at that distance, the desire for sufficient energy to drive many instruments means any mission would really need to go with radioisotope thermal generators (RTGs) - solid state electrical generators powered by the heat of radioactive decay.

BBC: NEWS | Science/Nature | Europe tells US: 'Come to Europa'

He had installed two of the earliest automatic garage-doors on record, powered by ancient Sears solid-state technology, and they worked fantastically for a decade or so.

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In its current state, the Pebble prototype is powered by a circuit board that's much larger than the watch itself.

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