There is perhaps no more compelling question for mankind than, are we alone in the universe? Given the odds, with billions of stars in our galaxy similar to our sun and billions of planets orbiting them, it seems unlikely. But, as Fermi's paradox asks, if aliens do exist, why haven't we found any evidence of them yet? Astronomers at Cornell University have done the sums to provide an estimate of when we might expect a call from ET, but don't worry about marking the date on your calendar – they believe contact isn't likely for another 1,500 years.
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