Meticulous observations of the disk of gas and dust around one young star seem to imply icy, comet-like bodies in the disk's inner regions. Could these be the building-blocks of water-rich planets like Earth?
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van Boekel, R. Water worlds in the making. Nature 447, 535–536 (2007). https://doi.org/10.1038/447535a
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DOI: https://doi.org/10.1038/447535a
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