...a general method of classifying how technologically advanced a civilization is. [...] 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 [~1016 Watts], Type II of its solar system [~1026 Watts], and Type III of its galaxy [~1036 Watts].
A Scale Model of Time Itself
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