A Dyson sphere is a hypothetical structure that surrounds a star to capture its energy output. Proposed by physicist Freeman Dyson in 1960, this concept suggests that advanced civilizations could harness vast amounts of energy by building a shell or swarm of satellites around their star. The energy collected could be used to power technology, support life, or facilitate space exploration. While no Dyson spheres exist, the idea has inspired scientific discussions about the potential for extraterrestrial life and the future of human energy consumption in the universe.