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How many of the habitable planets are less than 4 times the radius of Earth?​
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How many of the habitable planets are less than 4 times the radius of Earth?​

User LizzyPooh
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Based on the findings, the Kepler team estimated there to be "at least 50 billion planets in the Milky Way" of which "at least 500 million" are in the habitable zone
User Nigel Hawkins
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