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The faint young Sun paradox or faint young Sun problem describes the apparent contradiction between observations of liquid water early in Earth's history and the astrophysical expectation that the Sun's output would be only 70 percent as intense during that epoch as it is during the modern epoch. [1]
1 day ago · The solution to this “faint young Sun paradox” appears to lie in the presence of unusually high concentrations of greenhouse gases at the time, particularly methane and carbon dioxide. As solar luminosity gradually increased through time, concentrations of greenhouse gases would have to have been much.
- Stephen T. Jackson
Jun 1, 2011 · The Sun was fainter when the Earth was young, but the climate was generally at least as warm as today; this is known as the ‘faint young Sun paradox’. Rosing et al. 1 claim that the paradox can...
- Colin Goldblatt, Kevin J. Zahnle
- 2011
The Faint Young Sun Paradox. Our star, the Sun, started its life when hydrogen first ignited to make helium, at its center where pressure and temperature are greatest. The explosion attempted to tear the star apart. But the inward pressure generated by gravity prevented this.
Apr 18, 2013 · Scientists call this conundrum the “faint young sun paradox.” Billions of years ago, a dimmer sun shone down on a young Earth. But instead of a frozen planet, evidence reveals a watery past...
Jan 27, 2022 · The faint young sun paradox, as it’s known, has vexed scientists for decades. But recent work has led many researchers to think that we now have a solid hold on the problem.
Jun 2, 2024 · In 1972, legendary astronomer Carl Sagan and his colleague George Mullen proposed the Faint Young Sun Paradox: Why was the earth warm when the sun was dim? As it ages, our sun gets bigger, hotter, and brighter, thanks to the thermonuclear fusion reactions powering it.
