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Hi, this is Emily. In 1972, Carl Sagan and a colleague discovered something thats come to be known as the faint young sun paradox: ing to stellar physics, our sun has been growing brighter over time, thanks to increasing hydrogen fusion in the stars core. This means that the sun that shined on early Earth was roughly 25% dimmer than todays sun, which should have kept our baby planet cool enough for ice at the poles to grow and reflect more sunlight and cool the planet further - producing a literal snowball effect and turning Earth into a big ice cube. BUT: ing to rock and fossil evidence, ancient Earth was actually a melty, warm, watery haven for life, where simple single-celled organisms developed and thrived. Hence the paradox how could the sun be dim but the earth warm? Scientists have proposed a range of possible explanations, but the most likely one is that Earths early atmosphere included one or more ultra-insulating gases that kept its surface unseasonably toasty. We still