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An utterly emormous construction on an unthinkable scale. A mere theory, a Dyson Sphere is a "space ship" that encircles an entire star, so as to harvest ALL of its energy. To make a Dyson Sphere would provide an unimaginable amount of living space and energy. A lot of debates have been started over the size of a Dyson Sphere, but for a small(ish) star the diameter would have to be close to 200,000,000 km. Even though many people also debate whether there is even enough matter to MAKE a Dyson Sphere, almost everyone agrees that if a civilization were to have the ABILITY to make one, they wouldn't even have a use for a Dyson Sphere, as by that point they probably would have had something better. A Dyson Sphere for the solar system would be about 600 million times the surface area of the Earth.
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