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Earth's 'Bigger, Older Cousin' Maybe Doesn't Even Exist

03:55
The planet, known as Kepler-452b, was believed to be about 60 percent larger than our planet and within the habitable zone of its star. (NASA Ames/JPL-Caltech/T. Pyle)
The planet, known as Kepler-452b, was believed to be about 60 percent larger than our planet and within the habitable zone of its star. (NASA Ames/JPL-Caltech/T. Pyle)

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