The Kardashev scale is a general method of classifying how technologically advanced a civilization is. It was first proposed in 1964 by the Soviet astronomer Nikolai Kardashev. The scale has three designated categories called Type I, II, and III. These are based on the amount of usable energy a civilization has at its disposal, and the degree of space colonization. In general terms, a Type I civilization has achieved mastery of the resources of its home planet, Type II of its solar system, and Type III of its galaxy.
http://en.wikipedia.org/wiki/Kardashev_scale
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