Planetary civilization
Planetary civilization
Civilization capable of using all of the energy on its planet.
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Readers' pathsAug 2026 – Oct 2026
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Kardashev scale
Measure of a civilization's evolution.
66%
Michio Kaku
American theoretical physicist, futurist and author.
6.1%
Solar power
Conversion of energy from sunlight into electricity.
5.7%
Buck Rogers
Science fiction hero.
4.4%
Solar irradiance
Measurement of electromagnetic radiation.
3.7%
Flash Gordon
Comic strip character created 1934.
3.3%
Nikolai Kardashev
Soviet and Russian astrophysicist (1932–2019).
3.1%
Carl Sagan
American scientist and science communicator (1934–1996).
1.5%
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