About 22% of the 50 billion stars in the Milky Way similar to our sun are orbited by Earth-sized planets positioned to have water, according to a study published in the Proceedings of the National Academy of Sciences. "Planets seem to be the rule rather than exception," said University of California at Berkeley graduate student Erik Petigura, who led the study, which used data collected by NASA's Kepler space telescope over the course of three years.
Study: Billions of potentially life-supporting planets circling Milky Way stars
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