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faint young Sun paradox
climatology
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major reference
- In climate change: Faint young Sun paradox
Astrophysical studies indicate that the luminosity of the Sun was much lower during Earth’s early history than it has been in the Phanerozoic. In fact, radiative output was low enough to suggest that all surface water on Earth should have been…
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habitable zone
- In habitable zone: Changes in the Sun’s habitable zone
…is known as the “faint young Sun problem.” Another planet to which the faint young Sun problem might apply is Mars. On that planet the oldest regions of the surface show signs of running water while younger regions do not, which suggests that Mars had a warmer and thicker…
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