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NASA will reveal on Wednesday its list of the 400 stars most likely to contain planets harboring life. The statistics come from the Kepler observatory at NASA’s Ames Research Center in California, which has been analyzing data from 156,000 stars. The planets are all 500 to 3,000 light-years away and are within the “Goldilocks” zone that is neither too hot nor too cold. “I’ve argued that Kepler is more important than the Hubble Space Telescope,” says the project’s lead scientist. “We provide the data mankind needs to move out into space.”