What is a dysons sphere and how many years will it take to create a dysons sphere
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The rule of thumb for big projects is to base it on the doubling time. So if it takes 1 year to double the set of machines/collectors, and you start with 1 square meter's worth, you would reach the scale of a 1.0 AU Dyson sphere in about 79 years that way.
Although such megastructures may be theoretically possible, all plans to build a fixed-in-place Dyson sphere are currently far beyond humanity's engineering capacity. The number of craft required to obtain, transmit, and maintain a complete Dyson sphere far exceeds present-day industrial capabilities.
The website SentientDevelopments describes the Dyson sphere this way: It would consist of a shell of solar collectors (or habitats) around the star. With this model, all (or at least a significant amount) of the energy would hit a receiving surface where it can be used.
A Dyson Sphere/Shield World, or "shell" (as it appeared in the original paper by Freeman Dyson), is a hypothetical megastructure that was originally described as a system of orbiting solar-powered satellites meant to completely encompass a star and capture its entire energy output.
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Dyson sphere is a hypothetical megastructure made around a light emitting body such as stars or black or white holes.