A Dyson Sphere — a hypothetical megastructure that surrounds a star to capture all of its energy — has long been imagined as the hallmark of a super-advanced civilization. But in reality, such a construct would be both impossible and profoundly undesirable. The engineering challenges alone are insurmountable: the materials required exceed what exists in an entire solar system, and the structure would be gravitationally unstable, vulnerable to catastrophic collapse.
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