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for questions regarding the dimming of light from distant objects when it passes through interstellar dust and gas clouds. This is not for questions about extinctions of species on Earth or other planets.

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Extinction Level Event (Asteroid Impact Hypothesis) Likelihood Equation

Depending on how you count, there has been one known mass extinction due to impacts since the Cambrian 538.8 mya, so the rate might be on the order of $2\cdot 10^{-9}$ per year. …
Anders Sandberg's user avatar