why can we calculate the positions of stars above any point on the planet for any day in the last hundred years but a 2.3% chance of a city killer asteroid hitting earth in 10 years is the best guess we can make
why can we calculate the positions of stars above any point on the planet for any day in the last hundred years but a 2.3% chance of a city killer asteroid hitting earth in 10 years is the best guess we can make
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