Faint Young Sun Paradox
Version 1.0.0 · Updated 2026-07-31
CORE DEFINITION
A paradox proposed by astronomers Carl Sagan and George Mullen, noting that the early Sun was about 30% less luminous than today, yet geological evidence indicates that Earth maintained liquid water and relatively warm climate conditions about 4 billion years ago, contradicting predictions based on insufficient solar radiation.
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Explanation of climate stability. It prompts scientists to seek mechanisms for enhanced greenhouse effect on early Earth, such as higher carbon dioxide concentrations, methane greenhouse effect, etc., providing important clues for understanding complex feedback mechanisms in planetary climate systems.
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The 'Faint Young Sun Paradox' refers to the fact that according to stellar evolution, the early Sun's luminosity was about 25% lower than today, but geological evidence shows that early Earth was not frozen, requiring stronger greenhouse effects or other explanations.
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- en.wikipedia.orghttps://en.wikipedia.org/wiki/Faint_young_Sun_paradoxverified
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