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Many extensions and modifications to the Kardashev scale have been proposed.

Type 4 Kardashev Rating: The most straight forward extension of the scale to even more hypothetical Type IV beings who can control or use the entire universe or Type V who control collections of universes. The power output of the visible universe is within a few orders of magnitude of 1045 W. Such a civilization approaches or surpasses the limits of speculation based on current scientific understanding, and may not be possible. Zoltán Galántai has argued that such a civilization could not be detected, as its activities would be indistinguishable from the workings of nature (there being nothing to compare them to).

Type 4 Kardashev-Kaku Ratings (Michio Kaku): In his book Parallel Worlds, Michio Kaku has discussed a Type IV civilization that could harness "extragalactic" energy sources such as dark energy. Kardashev Alternate Rating Characteristics: Other proposed changes to the scale use different metrics such as 'mastery' of systems, amount of information used, or progress in control of the very small as opposed to the very large. Planet Mastery (Robert Zubrin): Metrics other than pure power usage have also been proposed. One is 'mastery' of a planet, system or galaxy rather than considering energy alone.

Information Mastery (Carl Sagan): Alternatively, Carl Sagan suggested adding another dimension in addition to pure energy usage: the information available to the civilization. He assigned the letter A to represent 106 unique bits of information (less than any recorded human culture) and each successive letter to represent an order of magnitude increase, so that a level Z civilization would have 1031 bits. In this classification, 1973 Earth is a 0.7 H civilization, with access to 1013 bits of information.

Sagan believed that no civilization has yet reached level Z, conjecturing that so much unique information would exceed that of all the intelligent species in a galactic supercluster and observing that the universe is not old enough to exchange information effectively over larger distances.
The information and energy axes are not strictly interdependent, so that even a level Z civilization would not need to be Kardashev Type Ⅲ. Microdimensional Mastery (John Barrow): John D. Barrow, going by the fact that humans have found it more cost-effective to extend any abilities to manipulate their environment over increasingly smaller dimensions rather than increasingly larger ones, reverses the classification downward from Type Ⅰ-minus to Type Omega-minus:

Type Ⅰ-minus is capable of manipulating objects over the scale of themselves: building structures, mining, joining and breaking solids;
Type Ⅱ-minus is capable of manipulating genes and altering the development of living things, transplanting or replacing parts of themselves, reading and engineering their genetic code;
Type Ⅲ-minus is capable of manipulating molecules and molecular bonds, creating new materials;
Type Ⅳ-minus is capable of manipulating individual atoms, creating nanotechnologies on the atomic scale and creating complex forms of artificial life;
Type Ⅴ-minus is capable of manipulating the atomic nucleus and engineering the nucleons that compose it;
Type Ⅵ-minus is capable of manipulating the most elementary particles of matter (quarks and leptons) to create organized complexity among populations of elementary particles; culminating in.
Type Omega-minus is capable of manipulating the basic structure of space and time.
According to this scale, humans, having wide expertise in various branches of Chemistry and Biology have passed the stage of Type III- minus. Signs of type IV-minus (that have had practical and widespread applications) have been seen in areas like nuclear physics, semiconductors and genetic engineering.

Civilizational Range (Robert Zubrin): Robert Zubrin adapts the Kardashev scale to refer to how widespread a civilization is in space, rather than to its energy use.
In his definition, a Type I civilization has spread across its planet.
A Type II has extensive colonies in its respective stellar system, and
A Type III has colonized its galaxy

(Wikipedia)
   

 

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