Scientists say a world that’s 490 light-years away qualifies as the first confirmed Earth-sized exoplanet that could sustain life. Elisa Quintana,an astronomer at the SETI Institute at NASA Ames Research Center,told the journal Science,The planet, known as Kepler-186f, is “more of an Earth cousin than an Earth twin.” Quintana is the lead author of a report on the planet published by Science this week.
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