Kepler finds 4 potentially habitable worlds

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in space on (#3F4)
story imageKepler has found 700+ worlds, 100 of which are roughly earth-sized, and 4 of which are both earth-sized and in their sun's Goldilocks Zone, and thus are potentially habitable. The BadAstronomer enthuses eloquently.
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Thirty eight, twenty nine, eighteen, 2 and twenty one: the 3rd number is?