When Will the Sun Make Earth Uninhabitable?

(Starts With A Bang!) – Ethan Siegel:

When our Sun was a newborn star, it likely only had about 75–80% of the power output it has today. Thanks to the flora, fauna, ocean and atmospheric properties of our planet, we’ve been able to adapt to steadily increasing temperatures for the entire history of our Solar System thus far. But there’s going to be a limit: at some point, the Sun’s luminosity will increase so much that the Earth, at our present distance from the Sun, will get hot enough that our oceans will boil. When this happens, the same runaway greenhouse effect that took place on Venus — where a thick layer of clouds enshrouded the planet — will happen on Earth as well, and all life on the surface will cease to exist. …

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Proton-proton chain

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