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Harvesting solar power in space and sending it back to Earth

Ever since electricity was discovered, humans have permanently tried to invent and use green methods of "harvesting" it. Solar power,  wind power,  hydroelectricity and geothermal power are only a part of Earth's sources of energy. Now, a former NASA engineer is working on a method that could produce 1/3 of Earth's total energy. As you know, the solar energy that's available in space is many times greater than the one we experience on our...