This device harnesses the cold night sky to generate electricity in the dark
A prototype powered a small light-emitting diode in a trial run
![night sky](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/09/091119_mt_antisolar_feat.jpg?fit=1028%2C579&ssl=1)
A new device that harvests energy from the cold night sky could one day light up rooms, charge phones and power devices for people off the grid.
Ryan Hutton/Unsplash