Scientists have invented a device similar to a solar panel that starts generating electricity after the sun goes down.
Researchers from UCLA and Stanford University have developed a panel similar in appearance to a solar panel only in works in the opposite way.
Instead of using the heat of the sun to produce electricity, the panel uses the coolness of the night sky.
When the sun goes down and is no longer shining on the panel, the top side cools off quickly, while the underneath side stays warm much longer (from the radiant heat from the earth or a rooftop beneath it.)
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