Titan Holds Clue to Faint Young Sun Paradox

Titan Holds Clue to Faint Young Sun Paradox

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Earth should have been an ice cube in the very early days of our solar system, when the sun was cooler than today. Yet the primordial Earth was a watery sphere. This “faint young sun” paradox has puzzled researchers for decades, but now a look at the atmosphere of one of Saturn’s moons suggests a new solution.

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