Une sphère de Dyson est une mégastructure hypothétique qui encercle une étoile afin de capter un grand pourcentage de sa production d'énergie. Proposé par le physicien Freeman Dyson, ce concept est souvent présenté dans la science-fiction comme une solution pour les civilisations avancées confrontées à des pénuries d'énergie. Bien que la construction d'une telle structure soit actuellement au-delà de nos capacités technologiques, elle reste une idée intrigante pour l'avenir.
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