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"About a quarter of our galaxy's two hundred billion stars are orbited by planets that are habitable in the way Earth is. Given so many worlds — fifty billion in our own galaxy! — with similar life-friendly conditions, it's very likely that intelligent organisms have evolved elsewhere," writes the astrophysicist Dr. Avi Loeb in his book "Extraterrestrial." He will give a talk for the Hamptons Observatory and BookHampton on Tuesday.