NASA scientists said the Kepler-62e and Kepler-62f planets were the first potentially habitable worlds discovered that are less than twice the size of Earth:
Lisa Kaltenegger: We have for the first time potentially habitable planets less than twice the size of the Earth. http://t.co/iqSD5Kh2oQ
Bill Borucki: Kelper-62-e & 62-f are considered rocky and may be habitable. We don't know yet! http://t.co/iqSD5Kh2oQ
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