Physicist Freeman Dyson died today at age 96. In addition to his many scientific contributions, Dyson was the first to propose sufficiently advanced aliens would likely build "Dyson Spheres" around their home stars, which are giant shells that capture most of a star's energy to power a civilization.

Physicist Freeman Dyson died today at age 96. In addition to his many scientific contributions, Dyson was the first to propose sufficiently advanced aliens would likely build "Dyson Spheres" around their home stars, which are giant shells that capture most of a star's energy to power a civilization.

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