A Dyson sphere-- a concept developed by physicist Freeman Dyson-- would be an incredible feat of engineering and construction. A civilization would build a Dyson sphere around its solar system in order to harvest all the energy put out by its sun.
Exoplanet hunter Geoff Marcy and his team are now looking for Dyson spheres. Advances made to discover planets around other stars make such a search possible. Finding even one such object would open a new age for mankind.
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