Fuel cell

This Apollo-era fuel cell combined hydrogen and oxygen to make electricity, with a byproduct of water. It made about 1,400 watts continuously, but Jurvetson said it could not easily be turned down if the spacecraft needed less power from time to time.

February 7, 2012 3:59 AM PST

Photo by: Rafe Needleman/CNET

| Caption by: Rafe Needleman

 

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