Solar panels are great for powering devices during the day. But they don’t work after the sun goes down. Now, a new technology that takes advantage of the cold darkness of space may do the trick. Researchers used a thermoelectric device that relies on a temperature difference in two faces of an electrically conducting material to push electrons through from one side to the other and create a small electrical current. Thermoelectrics have been around for decades. Most are placed next to high heat sources such as car engines to generate the needed temperature difference.
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