"Is the solar-system sized bubble in the Consellation Cygnus a planetary nebulae or could it be an "AC" or astroengineering construction, also known as a Dyson sphere, named after Freeman Dyson of the Princeton Institute for Advanced Study who proposed the theory? Dyson's thought experiment suggested that in our search for advanced extraterrrestrial civilizations that Instead of radio signals we should look for spheres, which are artificial mega structures that enclose the orbit of a star, fabricated from the material of that solar system. The key is to distinguish a Dyson sphere from natural dust components. The Dyson sphere is the marker of what Kardashev calls a Type 2 civilization, which is capable of using up all the energy produced by a star. A Type three civilization uses up all the energy produced by a galaxy."" - Kurt Starnes