A Dyson Sphere is a hollow sphere around a sun with a circumference of 1 AU, with a hollow space inside. A Dyson Sphere of this size would have a surfac.
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If alien technological civilizations exist, they almost certainly use solar energy. Along with wind, it s the cleanest, most accessible form of energy, at least here on Earth. Driven by technological advances and mass production, solar energy on Earth is expanding rapidly.