The first definitive signs of water have been seen in the atmosphere of a Neptune-sized exoplanet, paving the way towards the search for water on smaller Earth-like planets. See Letter p.526
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Kempton, E. Window on a watery world. Nature 513, 493–494 (2014). https://doi.org/10.1038/513493a
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DOI: https://doi.org/10.1038/513493a