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How many alien civilizations are out there? A new galactic survey holds a clue.

The Milky Way is full of habitable real estate, with roughly half of all sunlike stars hosting Earth-size worlds that could be friendly to life.

How Many Aliens Are in the Milky Way? Astronomers Turn to Statistics for Answers | Scientific American

The tenets of Thomas Bayes, an 18th-century statistician and minister, underpin the latest estimates of the prevalence of extraterrestrial life

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