Dyson Spheres: How Advanced Alien Civilizations Would Conquer the Galaxy (Infographic) | Space.com

Astrophysicist Nikolai Kardashev proposed in 1962 that very old and advanced civilizations would be of three types:

A Type I civilization harnesses all the resources of a planet. Carl Sagan estimated that Earth rates about 0.7 on the scale.

A Type II civilization harnesses all the radiation of a star. Humans might reach Type II in a few thousand years.

A Type III civilization harnesses all the resources of a galaxy. Humans might reach Type III in a few hundred thousand to a million years.

Dyson Spheres: How Advanced Alien Civilizations Would Conquer the Galaxy (Infographic) | Space.com:

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