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Sun may not be a 'Goldilocks' star

The stars that are just right to support life might be dimmer and longer-lived than the sun

Want to make a planet that can sustain carbon-based life? Don’t park it in orbit around a sunlike star.

“For the long term, the sun may not be the best star,” says Edward Guinan of Villanova University in Pennsylvania, coauthor of a paper reporting a new model about the suitability of planets for life. Smaller, cooler stars called orange dwarf stars might be the most hospitable, he says.

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