The identification of the closest analogue of Earth so far, orbiting another star, suggests that small planets are common, and that the discovery of a candidate habitable planet in an alien star system could be just around the corner.
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Bean, J. Homing in on another Earth. Nature 478, 41–42 (2011). https://doi.org/10.1038/nature10578
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DOI: https://doi.org/10.1038/nature10578
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