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Are We Alone?Odds are, we aren’t the first advanced civilization in the universe, says a Rochester astrophysicist.By Leonor Sierra with Karen McCally ’02 (PhD)
frank1 IN A TRILLION TRILLION: We’re used to thinking that alien life is a remote possibility. But if the probability that another advanced civilization has existed at any time in the visible universe is any larger than this number, then humans are not the first or only such civilization. (Photo: J. Carpenter, T. H. Jarrett, and R. Hurt/Two Micron All Sky Survey, University of Massachusetts and the Infrared Processing and Analysis Center of the California Institute of Technology) More . . .

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